Step 1

Place onion, garlic and ginger in a food processor and process into a paste. Heat oil in a large skillet over medium heat, add onion paste and saute, stirring continuously, for about 10 minutes.

Step 2

Stir in the cumin, turmeric, salt, pepper, cardamom, cinnamon, cloves, bay leaves and nutmeg. Saute, stirring, for 1 to 2 minutes. Place chicken pieces in skillet and stir them around with the spice mixture until they are well coated.

Step 3

Saute for another 4 minutes, then pour in the tomatoes with liquid and stir. Reduce heat to low and simmer for 1 to 2 hours, or until the oil has separated from the liquid. Stir occasionally. (Note: If you simmer uncovered, the sauce will thicken; add water, or keep covered while simmering.)