Grandma's Sunday Gravy: Passata Perfection!

Ingredients

• 2 tablespoons olive oil
• 1 large yellow onion, finely chopped
• 4 cloves garlic, minced
• 1 teaspoon dried oregano
• 1/2 teaspoon dried basil
• 1/4 teaspoon red pepper flakes (optional)
• 48 fluid ounces passata
• 8 fluid ounces tomato paste
• 1/2 cup dry red wine
• 1 tablespoon granulated sugar
• 1 teaspoon salt, or to taste
• 1/2 teaspoon black pepper, or to taste
• Parmesan rind (about 2-3 inches), well-cleaned (optional)