Easy Onion Tomato Chutney Recipe with step by step pictures. This chutney is traditional South Indian chutney made with onions and tomatoes which is usually served with Idli, dosa or kuzhi paniyaram. It is popular side dish just like coconut, tomato & onion chutney. It is delicious, flavourful, spicy and slightly tangy. Learn how to make the best side dish for idli or dosa.