INGREDIENTS
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1/2 cup yellow cornmeal
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1/2 cup plus 2 tablespoons all-purpose flour (spooned and leveled)
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1 teaspoon baking soda
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Coarse salt and ground pepper
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1 tablespoon olive oil
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2 red bell peppers (ribs and seeds removed), thinly sliced
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1 medium red onion, chopped
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1 package (10 ounces) white mushrooms, trimmed and thinly sliced
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1 1/2 pounds ground sirloin
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1/4 cup tomato paste
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3/4 cup reduced-fat sour cream
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1 large egg, lightly beaten