Once onion is cooked, add turmeric, 2 teaspoons curry powder, 3/4 teaspoon garam masala, ¼ teaspoon cinnamon, 1 teaspoon coriander powder, ¼ teaspoon black pepper, ¼ teaspoon red chili powder, ½ teaspoon ground cardamom and ¼ teaspoon nutmeg powder. Saute mixture for about 1 minute on low heat. Be careful that spices shouldn't burn at this point. Turn off the heat.
Let the mixture cool down. Blend the mixture in a blender till it turns to smooth consistency.