1/4 cup extra-virgin olive oil
1/2 pound ground beef chuck
1/2 pound ground sirloin
4 teaspoons minced garlic
1/2 teaspoon dried oregano, crumbled
1/4 teaspoon crushed red pepper
2 tablespoons tomato paste
Two 28-ounce cans Italian peeled tomatoes, finely chopped, juices reserved
One 28-ounce can tomato puree
2 cups chicken stock or low-sodium broth
2 bay leaves
6 thyme sprigs, tied together with kitchen string
Pinch of sugar
Salt and freshly ground pepper
1 1/2 pounds sweet Italian sausage, casings removed
2 pounds fresh ricotta
1/4 cup finely chopped flat-leaf parsley
2 tablespoons finely chopped basil
1/2 cup freshly grated Parmesan cheese
1 pound packaged whole-milk mozzarella, shredded (3 cups)
1 large egg, beaten
12 dried lasagna noodles