3 tablespoons olive oil

1 large onion, finely chopped

4 cloves garlic, smashed

1 1/4 pounds combined lean ground beef, veal and pork

24 cannelloni or manicotti shells

1 1/2 pounds ricotta cheese

2 large eggs

1/2 cup grated Asiago or Parmesan cheese

1/4 cup chopped fresh parsley

Salt and pepper

1 32 ounce can Italian plum tomatoes

1/4 cup chopped fresh basil

3/4 pound mozzarella cheese, thinly sliced