INGREDIENTS
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5 tablespoons (2 1/2 ounces) butter
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1 tablespoon vegetable oil
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1 cup (about 4 1/2 ounces) chopped onions (2 small-to-medium onions)
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1 (one) 28-ounce can tomato purée or tomatoes in purée
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1/2 teaspoon basil
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1/4 teaspoon thyme
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a couple of shakes of black pepper
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3 tablespoons King Arthur Unbleached All-Purpose Flour
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1 can (a scant 2 cups, 14 to 15 ounces) chicken broth
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1/4 teaspoon baking soda
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1 to 3 tablespoons sugar, to taste
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1 (one) 12-ounce can evaporated milk
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1/2 teaspoon salt