3 cups halved grape tomatoes, divided1 large onion, sliced1 1/2  pound smoked Italian sausage links, precooked (sliced into coins)20-30 basil leaves, divided4 garlic cloves, sliced1 pound dry linguine1 1/2 teaspoons kosher salt1 teaspoon fresh ground pepper4 1/2 cups water1 cup shredded Parmesan cheese Click here for direction