Tomato and Sausage Risotto

• servings: 4 servings
• total time: 45 minutes

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