INGREDIENTS
2 Tbsp. extra-virgin olive oil
1 lb. sweet or hot Italian sausage, casings removed
5 garlic cloves, 3 thinly sliced, 2 finely grated
½ tsp. dried oregano
¼ tsp. crushed red pepper flakes (optional)
1 28-oz. can crushed tomatoes
3 tsp. kosher salt, divided, plus more
1 5-oz. package baby spinach, coarsely chopped
2 15.5-oz. cans white beans, rinsed
4 Tbsp. unsalted butter
1 12" crusty Italian sub roll, cut in half crosswise, split lengthwise, or 2 ciabatta rolls, split lengthwise
1 oz. Parmesan or Pecorino, finely grated
Chopped parsley (optional)