10-Minute Avocado and Red Onion Salad
You know those evenings when you’ve got thirty minutes, a hungry family, and absolutely no desire to scrub a mountain of pots? This Avocado and Red Onion Salad is my secret weapon for exactly those nights — it comes together in the time it takes to set the table, and my kids absolutely devour this every time I make it.
Recipe Overview
- Prep time: 10 minutes
- Cook time: 0 minutes
- Total time: 10 minutes
- Servings: 4 as a side, 2 as a main
- Difficulty: Easy
Why You’ll Love This Avocado and Red Onion Salad
- No cooking required. There’s no stove, no oven, no hob — just a knife, a board, and a bowl. You can make this in your work clothes without worrying about splatters.
- Minimal washing up. One salad bowl, one jar for dressing, and a chopping board. That’s it. No baking trays, no saucepans, no colander.
- Make-ahead friendly, much like our Quick Weeknight Everything Green Salad With Avocado Dressing. You can prep the red onion and dressing up to two days in advance. When you get home, you’re literally five minutes from serving.
- Naturally filling and satisfying, just like our Quick Weeknight Roasted Chickpea and Brown Rice Grain Bowl. The healthy fats from the avocado and the crunch from the onion mean this salad keeps you full without weighing you down. Friends always ask me for this recipe after trying it at dinner parties, just like they do for our 10-Minute Summer Berry and Goat Cheese Salad .online/lemon-herb-couscous-bowl-a-quick-20-minute-dinner/”>Lemon Herb Couscous Bowl: A Quick 20-Minute Dinner.online/10-minute-seared-tuna-and-mango-salad-bowl/”>10-Minute Seared Tuna and Mango Salad Bowl.
- Adaptable to whatever you have. Got some leftover chicken? Toss it in. Cherry tomatoes about to go soft? Chop them in. This salad works with whatever bits are lingering in your fridge.
Ingredients You’ll Need
- 2 large ripe avocados
- 1 medium red onion (about 100g)
- 200g cherry tomatoes
- 1 small cucumber (about 150g)
- 100g feta cheese (optional)
- Large handful of fresh coriander (about 20g)
- 3 tablespoons extra virgin olive oil
- 2 tablespoons red wine vinegar
- 1 tablespoon lemon juice (freshly squeezed)
- 1 teaspoon Dijon mustard
- ½ teaspoon salt
- ¼ teaspoon black pepper
- 1 teaspoon honey or maple syrup
Tip: For the best flavour, use avocados that yield slightly to gentle pressure — they should feel like the palm of your hand when you squeeze them gently. Rock-hard avocados won’t give you that creamy texture this salad relies on.
How to Make Avocado and Red Onion Salad
- Prepare the red onion. Peel and halve the red onion, then slice it into thin half-moons as fine as you can manage — about 2mm thick. Place the slices in a small bowl and cover with cold water. Let them sit for 5 minutes. This tames the sharp, almost spicy bite of raw onion. You’ll notice the water turning a faint pink colour and the onion slices becoming slightly translucent at the edges.
- Make the dressing. While the onion soaks, combine the olive oil, red wine vinegar, lemon juice, Dijon mustard, honey, salt, and pepper in a small jar. Screw the lid on tightly and shake vigorously for about 20 seconds. The dressing should look emulsified — cloudy and slightly thickened, with no visible separation of oil and vinegar. Set it aside.
- Prep the vegetables. Halve the cherry tomatoes (or quarter them if they’re large), and dice the cucumber into small cubes about 1cm across. Roughly chop the coriander leaves and tender stems. Drain the red onion slices and pat them dry with a clean tea towel or kitchen paper. You’ll see the onions have softened slightly and lost that aggressive raw white colour.
- Cut the avocados. Halve each avocado lengthwise around the stone, twist to separate, and remove the stone. Score the flesh in a diamond pattern while it’s still in the skin — cut down to the skin but not through it. Then scoop out the cubes with a spoon. They should come out in neat, creamy chunks. If they’re mushy, your avocado was too ripe.
- Assemble the salad. Place all the prepared ingredients — avocado chunks, tomatoes, cucumber, drained red onion, and coriander — in a large salad bowl. If you’re using feta, crumble it over the top now. The colours should be vibrant: deep green avocado, bright red tomatoes, pale green cucumber, and purple-red onion.
- Dress and toss. Give the dressing jar one more shake, then drizzle about three-quarters of it over the salad. Use your salad servers to gently toss everything together — fold the ingredients over each other rather than stirring vigorously, as you want to keep the avocado chunks intact. The dressing should lightly coat every piece without pooling at the bottom of the bowl.
- Rest and serve. Let the salad sit for 2-3 minutes before serving. This brief rest allows the flavours to meld — you’ll notice the vinegar and lemon mellowing the richness of the avocado. Taste and add more dressing, salt, or pepper if needed. The avocado should still be firm but yielding, the onion pleasantly sharp but not overwhelming.
Tips From My Kitchen
- Soak the onion in cold water, not hot. Hot water will cook the onion slightly, making it floppy and sad. Cold water gently removes the harsh sulphur compounds while keeping the onion crisp and crunchy. This is the single most important step for a balanced salad — don’t skip it, even if you’re in a hurry.
- Use a sharp knife for the avocado. A dull knife can slip off the avocado skin and straight into your hand. I use a serrated knife for cutting through the skin and a flat blade for scooping. The avocado should cut cleanly with no ragged edges — if you’re seeing torn, mushy bits, sharpen your knife.
- Make the dressing in a jar, not a bowl. A jar with a tight-fitting lid lets you shake the dressing into perfect emulsion in seconds. It also stores any leftover dressing directly in the fridge, ready for tomorrow’s lunch. No whisk, no mess, no extra bowl to wash.
- Add the avocado last. If you toss everything together with the avocado first, it gets crushed and bruised by the other ingredients. Add the avocado as the final ingredient before dressing, and fold gently. You want distinct cubes of avocado, not avocado mush running through the entire salad.
- Prep ahead for instant assembly. Slice the red onion, make the dressing, and chop the coriander up to two days ahead. Store the onion in a container of cold water in the fridge, the dressing in its jar at room temperature, and the coriander wrapped in damp kitchen paper in a bag. When you walk in the door, you’re only minutes away from dinner.
Equipment You’ll Need
- Large salad bowl
- Sharp knife and cutting board
- Salad servers
- Small jar for dressing
Common Mistakes to Avoid
- Overcrowding the bowl: If you pile everything into a bowl that’s too small, you’ll end up crushing the avocado as you toss. Use a bowl that’s at least twice the volume of your ingredients — you need room to fold and turn without bruising the delicate avocado chunks.
- Wrong temperature: This salad is best served at room temperature, not straight from the fridge. Cold dulls the flavour of avocado and makes the olive oil in the dressing congeal slightly. If you’ve prepped ahead, let the ingredients sit out for 10 minutes before assembling.
- Skipping the rest time: That 2-3 minute rest after dressing is crucial. It lets the vinegar and lemon juice penetrate the surface of the avocado and tomato, balancing the richness with acidity. Serve immediately and the flavours will sit on top of each other rather than blending together.
What to Serve With Avocado and Red Onion Salad
- Grilled chicken or fish — the creamy avocado pairs beautifully with a simple lemon-herb marinade
- Warm flatbreads or pitta to scoop up every last bit
- A bowl of Quick Mediterranean Orzo Salad For Busy Weeknights for a double-salad dinner
- Grilled halloumi slices for a vegetarian option that adds salty, squeaky texture
- Leftover roast chicken or lamb, shredded and folded through just before serving
Still hungry for ideas? You might also love Sweet Corn Salad With Avocado, Easy Weeknight Quick Tuna Salad Loaded Avocado Halves from our sister kitchens.
Frequently Asked Questions
Can I make this salad ahead of time?
You can prep the components up to two days in advance — slice the onion, make the dressing, and chop the coriander — but I strongly recommend adding the avocado and dressing just before serving. Avocado oxidises and turns brown within about an hour of being cut, even with lemon juice on it. For a lunchbox, pack the dressing separately and add it at the table.
How do I keep the avocado from turning brown?
The lemon juice in the dressing helps slow oxidation, but it’s not a permanent solution. For the best appearance and flavour, cut your avocado just before serving. If you must prep ahead, brush the cut surfaces with extra lemon juice and press cling film directly onto the surface of the avocado halves before refrigerating.
Can I use a different onion?
Red onion is ideal because it’s milder and sweeter than white or brown onions, and it adds that beautiful purple colour. If you only have white onion, slice it very thinly and soak it in cold water for at least 10 minutes instead of 5 to mellow the bite. Spring onions work too, but they won’t give you the same crunch or visual contrast.
Is this salad suitable for meal prep?
Yes, with one important caveat: keep the avocado whole until you’re ready to eat. Prepare the onion, tomatoes, cucumber, and dressing, then store them separately in the fridge. Each morning or evening, cut one avocado per portion and toss with the prepped ingredients and dressing. This way you get fresh, creamy avocado every time without any browning.
What can I add for more protein?
This salad welcomes protein beautifully. Try adding shredded roast chicken, flaked tinned tuna, grilled prawns, or cubed halloumi. For a plant-based option, add a can of drained chickpeas or some toasted pine nuts. If you’re after something more substantial, serve it alongside Grilled Chicken Pasta Salad Easy for a complete meal.
Avocado and Red Onion Salad
A refreshing and vibrant salad featuring creamy avocado, crunchy red onion, cherry tomatoes, cucumber, and feta cheese, tossed in a tangy honey-mustard vinaigrette.
Ingredients
Method
-
Prepare the red onion. Peel and halve the red onion, then slice it into thin half-moons as fine as you can manage — about 2mm thick. Place the slices in a small bowl and cover with cold water. Let them sit for 5 minutes. This tames the sharp, almost spicy bite of raw onion. You’ll notice the water turning a faint pink colour and the onion slices becoming slightly translucent at the edges.
-
Make the dressing. While the onion soaks, combine the olive oil, red wine vinegar, lemon juice, Dijon mustard, honey, salt, and pepper in a small jar. Screw the lid on tightly and shake vigorously for about 20 seconds. The dressing should look emulsified — cloudy and slightly thickened, with no visible separation of oil and vinegar. Set it aside.
-
Prep the vegetables. Halve the cherry tomatoes (or quarter them if they’re large), and dice the cucumber into small cubes about 1cm across. Roughly chop the coriander leaves and tender stems. Drain the red onion slices and pat them dry with a clean tea towel or kitchen paper. You’ll see the onions have softened slightly and lost that aggressive raw white colour.
-
Cut the avocados. Halve each avocado lengthwise around the stone, twist to separate, and remove the stone. Score the flesh in a diamond pattern while it’s still in the skin — cut down to the skin but not through it. Then scoop out the cubes with a spoon. They should come out in neat, creamy chunks. If they’re mushy, your avocado was too ripe.
-
Assemble the salad. Place all the prepared ingredients — avocado chunks, tomatoes, cucumber, drained red onion, and coriander — in a large salad bowl. If you’re using feta, crumble it over the top now. The colours should be vibrant: deep green avocado, bright red tomatoes, pale green cucumber, and purple-red onion.
-
Dress and toss. Give the dressing jar one more shake, then drizzle about three-quarters of it over the salad. Use your salad servers to gently toss everything together — fold the ingredients over each other rather than stirring vigorously, as you want to keep the avocado chunks intact. The dressing should lightly coat every piece without pooling at the bottom of the bowl.
-
Rest and serve. Let the salad sit for 2-3 minutes before serving. This brief rest allows the flavours to meld — you’ll notice the vinegar and lemon mellowing the richness of the avocado. Taste and add more dressing, salt, or pepper if needed. The avocado should still be firm but yielding, the onion pleasantly sharp but not overwhelming.
Notes
Let the salad rest for 2-3 minutes before serving to allow flavors to meld. Feta cheese is optional.
I’d love to hear how this Avocado and Red Onion Salad works for your busy weeknights — drop a comment below and let me know what you served it with, or if you found a clever shortcut that shaved off even more time. For more quick dinner inspiration, have a look at our Dinner Recipes collection, or try the Creamy Lemon Butter Shells With Peas 20 Minute Dinner for another speedy family favourite.
