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Heat the butter and oil in a frying pan. Fry the onion, bay and a pinch of salt gently for 15 mins over a low heat until the onions are softened and translucent. Add the garlic and sage and fry for 1 min. Leave to cool for 10 mins.
Heat the oven to 180C/160C fan/gas 4. Stir the breadcrumbs and beaten egg through the onion mixture. Season to taste. Divide into 12 balls, weighing for accuracy, if you like. Bake on a flat baking sheet lined with parchment for 25-30 mins or until golden brown. Serve as part of a roast dinner.