Heat 4 tablespoon of sesame oil in a pan.
Add ½ teaspoon mustard seeds , allow it to crackle.
Add 1 tablespoon of Chana dal , 2 tablespoon of urad dal and 1 sprig curry leaves.
Saute till it dal turns golden in colour , add asafoetida
Now add in sliced onions and saute till it turns translucent.
Add the above blend masala , mix well.
Cook for 6-8 minutes till masala blends well with onions and starts to release oil at corners.
Add 1 ½ teaspoon of salt and mix well.
Add citron lime juice and cook for 4-5 minutes on low heat.
Turn off the heat , Heralekai Gojju / Citron Lime Masala paste is ready . Once it is cool , store it in a dry glass jar.