Heat oven to 200ºC/180ºC fan/gas 6. Gently heat the oil in a shallow saucepan then add the onion, celery and garlic. Keep everything sizzling on a medium heat for 15 mins until soft. Tip into a food processor with the rest of the ingredients, except the egg, plus a small pinch of salt, if you like. Pulse until everything is chopped, then add the egg and pulse until combined. Use wet hands to roll the mixture into walnut-sized balls, then place on a baking tray lined with baking parchment.
Bake in the oven for 25-30 mins until golden and hot through.
These will freeze for up to three months so you can make them before the mad rush of making Christmas day dinner starts.
Note if you are freezing ahead of time ensure you defrost fully before reheating.
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