Slow Cooker Cheese Steaks
Ingredients:
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2 pounds beef tri tip steak
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1 cup beef stock
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1 tablespoon red wine vinegar
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1 tablespoon Worcestershire sauce
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2 teaspoons olive oil
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1 large onion, sliced
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1 large green pepper, sliced
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8 ounces sliced fresh mushrooms
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12 slices white American cheese
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6 French or Italian sandwich rolls, split