Homemade chipotle molasses BBQ sauce

Makes 400ml Prep 10 mins Cook 20 mins 20p a tbsp 20 kcals, 0g fat, 0g sat. fat, 4g sugar

Heat 1 tbsp olive oil in a large saucepan. Add ¤ w i Þ V ««i` small onion and 2 chopped garlic cloves, and cook for 5 mins or until soft. Add 100ml apple cider vinegar, 85g dark soft brown sugar, 1½ tsp each mustard powder, smoked paprika and celery salt, 2 tsp hot chilli powder, 1 tbsp Worcestershire sauce, 2 tsp chipotle paste, 2 tbsp tomato purée, 1 tbsp liquid smoke (optional), 350ml passata and 75ml black treacle. Bring to the boil, then turn down to simmer for 15 mins. Leave to cool.