Ingredients
Method
1.Heat olive oil in large saucepan; cook onion, stirring, until soft. Add sugar, tomatoes, allspice and celery salt; bring to a boil then reduce heat.
2.Simmer, uncovered, stirring occasionally, about 30 minutes or until mixture thickens. Stir in tomato paste and vinegar; cook, uncovered, 5 minutes.
3.Blend or process sauce until smooth; push through fine sieve into medium bowl. Discard solids. Serve sauce cold.