Use 6-quart slow cooker with oven-safe baking dish inserted. Place the dish inside of the slow cooker, and add the asparagus. Add 1 tsp of zest, the lemon juice, garlic slices, butter, and pepper to the asparagus. Stir to combine. There is no need for additional water around base of baking dish. Cover and cook on HIGH for 2 hours.
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