Ingredients:

2 1/2 cups coriander seeds
1 1/2 cups red chillies
1/2 cup black peppercorns
3/4 cup red gram dal (pigeon peas, toor dal) -- picked over & rinsed
4 tablespoons Bengal gram dal -- picked over & rinsed (yellow split peas, channa dal)
1/2 tablespoon cumin seeds
1 teaspoon ground turmeric
1 small bunch curry leaves

How to Prepare:

In a heavy saucepan, dry-roast all the ingredients seperately, until they each give off a strong aroma. (However do not roast the Ground turmeric.)
Place all the ingredients in an electric blender or food processor. Blend into a fine powder.
Store in an airtight container and use as required.