Cheesy Spinach Lasagna

Ingredients

• For the Pasta
• 450 grams ‘00’ pasta flour or all-purpose flour, plus more for rolling out
• 50 grams semola rimacinata or semolina flour
• 285 grams eggs, from about 5 large eggs and 2 large egg yolks
• Or, if you're not making your own pasta:
• 1 pound store-bought lasagna noodles (not the no-boil kind)
• For the Lasagna Filling & Assembly
• 1 1/2 pounds (680 grams) spinach or a mix of hearty greens like chard, kale, dandelion, and mustard greens
• 1/4 cup (55 grams) unsalted butter or extra-virgin olive oil
• 1/2 yellow onion or 1 shallot, minced
• 4 garlic cloves, thinly sliced
• Kosher salt and freshly ground black pepper
• 1 (15- or 16-ounce) container (454 grams) whole-milk ricotta
• 4 ounces (113 grams) mascarpone
• 2 1/2 ounces (75 grams) finely grated Parmigiano Reggiano, plus more for topping
• Freshly grated nutmeg
• 1 large egg, beaten
• 1/4 cup (55 grams) unsalted butter
• 1/3 cup (55 grams) all-purpose flour
• 1 quart (975 ml) whole milk
• 6 ounces (170 grams; 1½ cups) grated Fontina, plus more for topping
• 4 ounces (113 grams; 1 cup) grated low-moisture mozzarella, plus more for topping

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