If you want a simple Indian side dish loaded with fresh flavour, this Indian Onion Salad (kachumber) is ideal. Crisp red onion, juicy tomato and crunchy cucumber are brightened with fresh lemon juice and chopped coriander, creating a vibrant, refreshing salad that pairs perfectly with curries or can be enjoyed on its own.
Sometimes served with poppadums in restaurants, this salad is versatile: add a finely chopped green chilli for heat, or keep it mild for a family-friendly side. It comes together in minutes, making it perfect for busy evenings or when you need a bright, healthy accompaniment.
How to make Indian Onion Salad
Follow the simple steps below to make a crisp, well-balanced kachumber salad. The technique focuses on even chopping, light seasoning and a short rest to let flavours meld.
Step by Step Recipe
Indian Onion Salad (Kachumber)
Serves: 4 · Prep time: 10 mins · Cook time: 0 mins · Calories: 92 kcal (per serving)
Summary
This classic Indian salad uses red onion, cucumber and tomato with a squeeze of lemon and chopped coriander. Dice ingredients to match how you plan to serve it: very fine for poppadums, chunkier for a curry side. Add a green chilli if you want extra spice. Ready in minutes, it’s a fresh, crunchy side that brightens any meal.
Ingredients
- ½ red onion, finely diced
- 1 large tomato, deseeded and diced
- ¼ cucumber, diced
- Juice of ½ lemon
- Few sprigs coriander, chopped
Optional
- 1 green chilli, finely chopped (optional, for heat)
Equipment
- Cutting board
- Sharp chef’s knife
- Large mixing or serving bowl
Instructions
- Wash all vegetables thoroughly under cold running water.
- Finely dice the red onion and place into a large bowl.
- Deseed the tomato: cut in half, scoop out the seeds with a spoon, then dice the flesh. Discard the seeds to avoid excess water in the salad.
- Dice the cucumber to a similar size as the onion and tomato. Consistent sizing makes the salad more pleasant to eat and looks neater when served.
- Chop the coriander leaves finely. If you prefer, use chopped mint instead.
- Add the lemon juice and a pinch of salt to taste, then toss everything together until evenly combined. Stir in the chopped green chilli if using.
- Cover and refrigerate for 5–10 minutes before serving to let the flavours meld. Serve chilled as a side to curries, with poppadums, or as a fresh salad on its own.
Notes
For poppadum accompaniment, dice the ingredients very finely so they sit nicely on a crisp poppadum. If serving alongside a curry, slightly larger chunks give more texture and substance. Adjust lemon and salt to taste just before serving to keep the vegetables crisp.
Ingredients explained
Each ingredient adds texture and balance. Cut everything to a consistent size so every spoonful has a mix of flavours.
Onions
Red onions bring a sweet, sharp backbone to the salad. If you prefer a milder taste, try sweet onions, shallots or spring onions—these lose some of the raw bite when served fresh.
Tomatoes
Tomatoes add juiciness and acidity to balance the onions. Use large, firm salad tomatoes and remove seeds to prevent the salad becoming watery. Cherry tomatoes can be used for a sweeter flavour.
Cucumber
Cucumber contributes a cool crunch that refreshes the palate and complements richer dishes.
Herbs
Coriander is traditional, adding a bright, herbaceous note. If you dislike coriander, chopped mint is an excellent substitute and gives a fresher aroma.
Lemon juice
Fresh lemon ties the salad together, cutting through the raw onion and lifting the other ingredients. Lime can be substituted if preferred.
Green chilli
Finely chopped green chilli adds heat and depth if you like spice—use sparingly and taste as you go.
Serving suggestions
Serve this salad with poppadums, chutney and raita for a classic accompaniment, or alongside any spicy curry to provide a cooling, crisp contrast. It also works well as a light starter or a healthy addition to a shared platter.
Storage
Store in an airtight container in the refrigerator and eat within 1–2 days. Vegetables will release water over time, which makes the salad less crisp, so it’s best enjoyed soon after preparation.
Background
Kachumber-style salads are common across Indian cuisine and are prized for their freshness and balance. A simple lemon-dressed mix of raw vegetables acts as a palate cleanser beside rich, spicy dishes and highlights the value placed on contrasting textures and flavours in Indian food.
