Ingredients:

1 pound sweet Italian sausage, casings removed
12 ounces lean ground beef
1/2 cup minced white or yellow onion
2 cloves garlic, coarsely chopped or minced
28 ounces canned, no-salt-added crushed tomatoes and their juices
12 ounces canned, no-salt-added plain tomato paste
13 ounces canned, no-salt-added plain tomato sauce
1/2 cup water
2 tablespoons sugar
1 1/2 teaspoons ground dried basil
1/2 teaspoon fennel seed
1 teaspoon Italian seasoning blend
2 teaspoons kosher salt, plus more for the cooking water
1/4 teaspoon freshly ground black pepper
1/4 cup chopped fresh flat-leaf parsley, plus more for garnish
12 pieces dried lasagna pasta (each 2 1/2 to 3 inches wide and about 13 inches long)
1 pound part-skim ricotta cheese
1 large egg
12 ounces low-fat mozzarella cheese, sliced
3/4 cup freshly grated Parmigiano-Reggiano cheese, plus more for optional garnish