"My grandchildren love these sandwiches. I like the recipe because it can be made ahead of time and keeps well in a slow cooker. I've found that it freezes well, too. —Patricia Ringle, Edgar, Wisconsin..."
INGREDIENTS
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2 pounds ground beef
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1 large onion, chopped
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1-1/4 cups ketchup
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1/2 cup water
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1 tablespoon brown sugar
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1 tablespoon white vinegar
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1/2 teaspoon salt
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1/2 teaspoon ground mustard
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1/2 teaspoon chili powder
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1/4 teaspoon ground allspice
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8 sandwich buns, split