Heat enough oil in a large saucepan to come one-third up the sides to 170°C

Meanwhile, place the flour, eggs and breadcrumbs into 3 separate wide, shallow bowls

Season the flour well with salt and pepper. Dust the mushroom fries in the flour, shaking off any excess, dip into the egg, then coat well in the breadcrumbs

In batches, deep-fry the fries for 5 minutes or until golden and cooked. Drain well on paper towel and season with salt

Mix harissa together with yoghurt. Serve with fries