Mozzarella Sticks

Name: Mozzarella Sticks
Ingredients: 1 lb. block mozzarella cheese, cut into 3-inch by 1/2-inch sticks; 3 ⁄ 4 cup flour; 4 eggs, lightly beaten; 2 cups Italian bread crumbs; 2 tbsp. olive oil; 1 Tbsp. unsalted butter; 2 garlic cloves, finely chopped; 1 medium yellow onion, finely chopped; 1 Tbsp. tomato paste; 1 (28-ounce) can whole peeled tomatoes, crushed by hand; 1 Tbsp. sugar; 1 tsp. chile flakes; Kosher salt and freshly ground black pepper; canola oil, for frying