Not so Sweet Sweet Potato Casserole

Food.com
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Ingredients

5 pounds sweet potatoes (scrubbed clean)
2 tablespoons butter (or 2 tablespoons margarine, cut into small pieces)
3/4 cups apple cider (or 3/4 cup apple juice)
1/2 teaspoons salt (to taste)
1/2 teaspoons ground black pepper (to taste)
1 cup gruyere cheese (shredded, or you could use Swiss cheese or any other cheese you prefer)
1 tablespoon fresh parsley (chopped)
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