The Best Baked Ziti

Name: The Best Baked Ziti
Ingredients: 0.75 pound hot Italian sausage; 0.75 pound sweet Italian sausage; 2 tablespoons olive oil; 1 large yellow onion, diced; 0.5 teaspoon dried oregano; 0.25 teaspoon dried thyme; 0.25 teaspoon dried rosemary; 2 (24 ounce) jars prepared marinara sauce; 2 cups water; 1 (16 ounce) package ziti pasta; 1 drizzle olive oil; 1.5 cups whole-milk ricotta cheese; 8 ounces mozzarella cheese, cut into small cubes; 1 cup grated Pecorino Romano cheese; 1 teaspoon chopped flat-leaf (Italian) parsley, or to taste