While the meatballs are cooking, wipe the frying pan out. Heat the oil over medium-high heat. Add onion & cook for 5 minutes, stirring occasionally, until onion is softened. Add garlic & cook 1 to 2 minutes until garlic is fragrant. Add tomato paste & wine. Cook, stirring occasionally, until the wine is reduce by about half. Add red pepper, tomatoes with their juice, sugar, salt & pepper. Break the tomatoes into chunks using the side of a spoon. Bring the sauce to a boil then reduce the heat to medium. Simmer, uncovered, stirring occasionally, for 10 minutes or until sauce is thickened.