Classic Barbecue Sauce

From The Art of Real Food, Seasonal Recipes for Every Week of the Year, by Joanne Neft and Laura Kenny: 2 tablespoons grapeseed oil 1 medium onion, finely chopped 3 or 4 large ripe tomatoes, finely diced (skin removed) 1/2 cup red wine vinegar 1/2 cup brown sugar, packed 2 tablespoons Worcestershire sauce 1/2 teaspoon […]