Ingredients
- 1/4 cup butter
- 3 cloves garlic, minced
- 1/4 cup all-purpose flour
- 4 cups whole milk
- 1 tablespoon Dijon mustard
- 2 teaspoons Worcestershire sauce
- 1 teaspoon salt, divided
- 1 teaspoon ground black pepper, divided
- 2 teaspoons lemon zest
- 2 tablespoons lemon juice
- 3 pounds russet potatoes, peeled and sliced 1/8-inch thick (7 cups)
- 1 cup thinly sliced onion
- 1 cup grated Parmesan cheese
- Chopped fresh chives and/or cracked black pepper
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