Make the Gravy: Heat 2tsp oil in a saute pan. Add the cloves, cardamom pods, onions, cashews and raisins; cook on medium heat until onions turn translucent. Add the ginger-garlic paste and cook until onions start to brown. Next add the crushed tomatoes, red chili powder, turmeric, garam masala and cook for 3-5 minutes. Remove from heat and when the mixture is cool enough to handle, grind into a smooth paste.