Step 1Preheat the oven to 180 °C/ 355 °F (fan assisted). Peel and chop the onion into big chunks. Blitz in food processor until fine. Alternatively, chop fine by hand.
Step 2Heat 1 tablespoon of olive oil in pan and fry the onion of a low heat for 5 - 10 minutes until soft. Remove from the heat.