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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