Butter Chicken (vegetarian)

Marinade for chicken/tofu:
  * 1 Tbsp cornstarch
  * 1-2 Tbsp garam or tandoori masala
  * 1/2 tsp ground ginger
  * 1/2 tsp garlic powder
  * 1/2 tsp turmeric
  * Optional: curry powder, coconut oil, chili powder, salt

Sauce
  * 2 Tbsp oil (olive or coconut)
  * 1 onion, diced
  * 14 oz can crushed tomatoes
  * 1 tsp tomato paste
  * 2 Tbsp ghee or butter
  * 1 1/2 Tbsp garlic, minced
  * 1 Tbsp ginger, minced or finely grated
  * 1 1/2 teaspoons ground cumin
  * 1 1/2 teaspoons garam masala
  * 1 tsp tandoori masala
  * 1 teaspoon coriander
  * 1 tsp red chili powder (adjust to your taste preference)
  * 1 tsp sugar
  * 1-2 tsp salt, to taste
  * 1 cup of heavy or thickened cream (or evaporated milk)
  * 1/2 teaspoon kasoori methi (or dried fenugreek leaves)