Step 1

Add the oil to a frying pan over a medium/low heat and sautee the onions for a few minutes until translucent but not browned.

Step 2

Add the garlic and cook for a further minute.

Step 3

Add the tomato passata, vinegar, syrup and spices and allow to cook, uncovered, for 10 minutes to reduce and thicken.

Step 4

Whiz in a blender or with a hand blender until smooth. If it’s too thick, add a little water to thin. Pour into a sterilised jar and store in the fridge.