Masala paste is the basis of many indian dishes such as curries and dry gravies (bhuna). Most curries start with a base of onion, garlic and ginger except for satwik (light, non-spicy) cuisine.Tomatoes are added for the acidity to counter excessive sweetness of onions. It is to be noted tomatoes when cooked the color intesifies and themselves turn slightly sweet.
1. A proper onion tomato masala is balanced.
2. The ingriedents dont over power each other.
3. The ingridients are properly cooked.
3. Undercooked paste has raw smell and taste that an cause stomach problems.
4. Well cooked masala is arromatic, has a dark color. When oil starts to separate from the paste, its a sign that its cooked.
Here is my take on the onion tomato masala paste-