I like chutney podi better than milagai podi for idlis or dosas because chutney podi has dry coconut and garlic in it.
Channa dhal - 1 cup
Urud dhal - 1 cup
Curry leaves - a few sprigs
Garlic cloves - 3 or 4
Red chillis - about 10(Varies according to your taste)
dry coconut(copra) - 1 cup
Sesame seeds - 2 tbsp
Hing - 1 tsp
Grated Jaggery - 2 tbsp(optional)
Dry fry channa dhal and urud dhal separately till golden brown. Dry fry rest of the ingredients together. Cool. Grind everything together.