STEP 2

Meanwhile, mix the mushrooms with the thyme and some seasoning. Heat a splash of oil in a large frying pan and fry the mushrooms in a couple of batches until golden. Tear the mozzarella into pieces and pat dry with kitchen paper. Top the baked polenta with the mushrooms and mozzarella, then bake again for 10 mins or until the cheese is melted and bubbling. Scatter the rocket over the tart and drizzle with the balsamic vinegar.