Green mangoes chopped into pieces - about 8 cups

Ginger and garlic - bashed up well - half a cup of each, and then mixed into a cup of slightly warm oil. 

Chilli powder - three quarter cup

Salt - 1 cup

Methi (fenugreek) powder - a teaspoon or two

Sunflower or Safflower oil - 2 cups, heated and then cooled before mixing with these ingredients.

You could use some of this oil to do a small talimpu (tarka or tempering): when oil is hot, add a teaspoon of mustard seeds and a teaspoon of cumin seeds and maybe even a few karyapak leaves.. Cool it before mixing into the rest. 

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Mix all together in a dry bowl then pack into a sterile jar. Edible immediately.