Adjust the sugar and salt to taste; for a sweeter chutney, add a little more sugar, and for extra tanginess, include a few more pieces of raw mango. If you prefer a spicier flavour, additional dried red chillies or increased amounts of fresh green chillies can be used. Leftovers can be stored in an airtight container in the refrigerator for up to one week. This tomato chutney or "chutni" reflects the Bengali love for balance in flavours - where sweet, sour and spicy coexist harmoniously. It's also delicious with toasties, dalpuri or pakoras.