3 cups halved grape tomatoes, divided
1 large onion, sliced
1 1/2 pound smoked Italian sausage links, precooked (sliced into coins)
20-30 basil leaves, divided
4 garlic cloves, sliced
1 pound dry linguine
1 1/2 teaspoons kosher salt
1 teaspoon fresh ground pepper
4 1/2 cups water
1 cup shredded Parmesan cheese
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