Step 1

Heat oil in a large, heavy-based saucepan over medium heat. Add onion. Cook, stirring, for 5 to 6 minutes or until onion has softened. Add garlic. Cook, stirring, for 2 minutes or until fragrant.

Step 2

Add tomato and sugar. Bring to a simmer. Reduce heat to low. Simmer, stirring occasionally, for 2 hours or until slightly thickened. Remove from heat. Stir in basil and season with salt and pepper. Serve.