1.Shallots can be replaced with big onion, but small onions elevate the taste.
2.Get wild caught sardines.
3.Check the ingredients and it should just contain sardines, oil and/or salt.
4.If the tin has salt, then skip salt, taste towards the end and add if required.
5.Increase or decrease green chillies as per your spice level.
6.You shall add chilli powder (after adding sardines) to make it spicier.