Tomato And Sausage Risotto

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Ingredients

1 can (28 ounces) diced tomatoes, in juice
1 tablespoon olive oil
3/4 pound sweet or hot italian sausage, casings removed
1 small onion, finely chopped
coarse salt and ground pepper
1 cup arborio rice
1/2 cup dry white wine
1 bunch flat-leaf spinach (10 to 14 ounces), washed well, tough stems removed, chopped (about 7 cups)
1/2 cup grated parmesan cheese, plus more for serving (optional)
2 tablespoons butter