Caper Sauce

6 tablespoons vegetable oil
1/2 cup chopped white onion
1 cup chopped peeled tomatoes
1 teaspoon mashed garlic
1 teaspoon dried tarragon leaves
Salt
Pepper
1/2 cup water
1 tablespoon instant chicken bouillon granules
1 teaspoon granulated sugar
1/2 cup capers, washed and drained

Heat oil in a Dutch oven and saut