
Chicken simmered in a slow cooker with curry spices and a mild, savory sauce!
Heat butter over medium heat. Add onion and cook until tender, about 5 minutes.
Place onions in a slow cooker with garlic, ginger, spices, crushed tomatoes, tomato paste, lemon zest and 1 cup of the heavy cream. Stir to combine.
Add chicken, stir and cook on low 4-5 hours.
Combine remaining cream with cornstarch. Stir half of the cream into the sauce and let sit for a few minutes to thicken. Add remaining cream mixture if needed. Cover and cook 15 minutes more.
Sprinkle with cilantro and serve over basmati rice.