Wash chickpeas in several changes of water. Cover with water, and leave to soak overnight.
Put chickpeas in a pot and add salt and fruit salts. Cover with water, bring to a simmer and cook chickpeas till softened, but still firm – around one hour. Remove from heat and drain well. If you want a warm salad, continue directly to the next steps, or set aside and refrigerate if required.
Place drained chickpeas in a bowl with onion, tomato, cucumber, and chilli. Sprinkle with the chaat masala, and toss well to coat. Taste and add a little salt if required.
Add the tamarind and date chutney, and stir gently to combine.
to serve
Sprinkle with sev, garnish with mint leaves and serve.
notes
Fruit salt is marketed under the brand name Eno. It is best obtained from a pharmacist, as supermarkets seem to only stock flavoured variants. For this recipe you can substitute baking soda - not baking powder.
sev are fried noodles made from chickpea flour and are readily available from good Indian grocers. If gluten-intolerant check they do not contain wheat flour.