This classic Rogan Josh recipe is made using a food processor to make the cooking process easier and more efficient. The recipe starts by blending together onions, garlic, ginger, and spices in the food processor to create a flavorful paste. The paste is then cooked with tender pieces of lamb, tomatoes, and yogurt until the meat is tender and the flavors have melded together. Serve this classic Rogan Josh with steamed rice or naan bread for a delicious and satisfying meal.