Ingredients
2 tablespoons extra virgin olive oil
1½ pound spicy Italian sausage, removed from the casing
3 shallots, finely minced
3 cloves garlic, finely minced
1/2 teaspoon red pepper flakes
2 teaspoons lemon zest, from 2 lemons
1 bunch broccoli rabe, trimmed and cut into 1-inch pieces
1½ teaspoons kosher salt
1 (25-ounce) jar marinara sauce
1/2 pound no-boil lasagna noodles
1 pound fresh mozzarella cheese, dried well and torn into large chunks
1½ cups grated Parmesan cheese
1/2 cup grated Gruyere cheese