1.Heat oil in large pan, add onions; cook, covered, over low heat, 20 minutes, stirring occasionally.
2.Meanwhile peel, seed and chop the tomatoes.
3.Add garlic to pan; cook, stirring occasionally, 5 minutes. Add tomatoes; bring to the boil. Reduce heat; simmer, uncovered, about 1½ hours or until mixture is the consistency of a pasta sauce. Stir in basil; cook, stirring occasionally, 10 minutes then season to taste with salt and pepper.
4.Pour sauce into freezer containers leaving 1-2cm above sauce for expansion. Cover, cool in refrigerator.
Related
Sign up for our newsletter
Want 20% off at THE ICONIC? Sign up to the latest news at Women’s Weekly Food.