If you prefer a spicier dish, add a minced fresh hot chili when adding the bell peppers.
Drain tomatoes, reserving 1/2 cup liquid. Set aside.
In large skillet, heat oil over medium heat. Add ‘sausage’ pieces and cook, turning often, until golden, about 5 minutes. Add onion and cook, stirring often, until softened, about 5 minutes. Stir in bell peppers and garlic. Cover and cook, stirring occasionally, 10 minutes.
Stir in tomatoes, reserved tomato liquid, parsley, oregano, salt, pepper and sugar until well combined. Cover and cook until flavors have blended, about 5 minutes. Spoon into hero rolls and serve open-faced.