Lobster Manicotti Fra Diavolo

Name: Lobster Manicotti Fra Diavolo
Ingredients: 2 tablespoons olive oil; 2 medium yellow onions, chopped; 1 teaspoon red pepper flakes (more or less, to taste); 3 cloves garlic, thinly sliced; 28-ounce can crushed fire-roasted tomatoes; 2 tablespoons lemon juice; Kosher salt and freshly ground black pepper; 7 ounces cooked lobster meat, drained, patted dry and roughly chopped (about 1 mounded cup); 1 cup whole-milk ricotta cheese; 1/4 cup chopped fresh basil, plus extra for garnish; 8-ounce box wide lasagna noodle sheets (10 sheets); Grated romano cheese (optional)