Step 1

Preheat oven to 180°C. Line a baking tray with non-stick baking paper. Arrange tomato and onion, in a single layer, on prepared tray. Roast in oven for 1 hour or until soft and lightly browned. Set aside for 15 minutes to cool.

Step 2

Transfer the tomato and onion to the bowl of a food processor and process until pulpy. Add the vinegar, season with pepper and process until smooth.