Tomato Coriander sauce

From Classic Indian Vegetarian and Grain Cooking by Julie Sahni

Makes 2 cups

3 Tb light veggie oil
1/2 c chopped onion
2 tea ground cumin
1 Lb fresh ripe tomatoes, pureed (or 2 c canned tomatoes, pureed)
1 c water
coarse salt, to taste
2 Tb chopped fresh coriander

Heat the oil in a small pan over medium-high heat. When it is very hot, add the onion and fry, stirring constantly, for 6-8 minutes or until brown. Add the cumin and continue frying for 1 more minute. Add the tomato puree, 1 c water, and salt; mix well and bring to a boil. Simmer gently over low heat, uncovered, for 15 minutes, stirring often. Turn off the heat adn stir in chopped coriander.