Heat the ghee in a dutch oven or heavy bottom pot over medium heat. Add the onions and sauté until they turn translucent and start to sweat, about 5-7 minutes, don't allow the onions to brown. Add ginger and garlic paste and let cook for 30 seconds, stirring so it doesn't burn. Add the can of crushed tomatoes along with the chili powder, coriander powder, and cumin powder and continue to cook for 5 minutes, if the mixture starts bubbling rapidly, add about ¼ cup of water and continue to cook.