Cincinnati Chili

Name: Cincinnati Chili
Ingredients: 4 tablespoons extra-virgin olive oil; 2 sweet onions (such as Vidalia), finely chopped, plus more for topping; 2 pounds ground beef chuck; Kosher salt and freshly ground black pepper; 4 cloves garlic, minced; 1 15-ounce can tomato sauce; 2 medium tomatoes, diced; 1/4 cup apple cider vinegar; 1/4 cup chili powder; 2 tablespoons paprika; 1 tablespoon ground cinnamon; 2 teaspoons ground cumin; 1/2 teaspoon ground allspice; 1/4 teaspoon ground cloves; 1/4 teaspoon cayenne pepper; 1 pound spaghetti, cooked; Pinto beans and grated cheddar cheese, for topping; Oyster crackers, for serving (optional)