Step 1: Heat oil and butter in a large pan. Cook onions until translucent then add garlic and thyme. Cook for a minute.
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Step 2: Add arborio rice and stir. Then add fresh mushrooms and truffle paste and cook until mushrooms are softened
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Step 3: Add vegetable stock a ladleful at a time, stirring constantly until each ladle of stock is absorbed before adding more. Cook for about 20 minutes, until rice is al-dente
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Step 4: Stir parmesan into the risotto then season with salt and pepper. Cool the risotto.
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Step 5: Spread the cooled risotto onto a tray. Mix in mozzerella then chill in fridge.
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Step 6: To assemble arancini balls, roll the chilled risotto into ping-pong sized balls. Add extra mozzarella in the centre if you want a cheesier arancini ball.
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Step 7: Place arancini balls in the Airfryer basket and cook for 12 minutes at 180°C, until golden brown.