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Creamy Mushroom Lasagna
Ingredients
  • 1 lb. dried lasagna
  • 3½ tsp. Diamond Crystal or 2 tsp. Morton kosher salt, divided, plus more
  • 16 Tbsp. (2 sticks) unsalted butter, divided
  • 2 lb. crimini mushrooms, trimmed, thinly sliced
  • 1½ tsp. freshly ground pepper, divided, plus more
  • 3 shallots, finely chopped
  • 8 garlic cloves, finely chopped
  • 2 Tbsp. finely chopped thyme
  • ½ cup all-purpose flour
  • 5 cups whole milk
  • 2 Tbsp. Dijon mustard
  • 2 tsp. finely grated lemon zest
  • 1 large egg
  • 6 oz. Parmesan, finely grated (about 3 cups)
  • 2 cups whole-milk fresh ricotta
  • 8 oz. low-moisture mozzarella, coarsely grated (1⅓ cups)
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