Ingredients
- 1/4 cup butter
- 1 medium onion, chopped (1 cup)
- 3 cloves garlic, minced
- 1/4 cup all-purpose flour
- 1/2 teaspoon salt
- 1/2 teaspoon ground black pepper
- 2 1/2 cups half-and-half
- 2/3 cup grated Parmesan cheese, plus more for garnish
- 1 tablespoon Worcestershire sauce
- 1 tablespoon Dijon mustard
- 2 teaspoons lemon zest
- 1 tablespoon lemon juice
- 2 1/2 pounds russet potatoes, peeled and sliced 1/8-inch thick (8 cups)
- Chopped fresh chives
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