Step 1

In a food processor or blender, blend together the tomatoes, onion, garlic, spices, and sugar until as smooth as possible.

Step 2

Pour mixture into the slow cooker and place chicken pieces and butter in as well. Give it a stir and cook on high for 3-4 hours or on low for 6-8 hours or until chicken is done.

Step 3

Stir in cream and cook for 30 minutes on low to thicken. Serve over white rice and with warm naan. Garnish with fresh cilantro if desired.