Ingredients

• 12 ounces 90%-lean ground beef
• 1 large onion, finely diced
• 2 cups finely chopped cremini mushrooms, (about 4 ounces)
• 5 plum tomatoes, diced
• 2 tablespoons all-purpose flour
• 1/2 cup water
• 1/4 cup cider vinegar
• 1/4 cup chili sauce, such as Heinz
• 1/4 cup ketchup
• 8 whole-wheat hamburger buns, toasted if desired

Description

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