To make the sauce, melt half the butter in a deep-sided frying pan or wok. Add half the mushrooms and cook over a high heat until all the liquid has evaporated; set aside. Repeat with the remaining butter and mushrooms. Deseed and finely chop the chilli and finely slice the garlic cloves. Add to the pan and cook for 2min. Roughly chop the sun-dried tomatoes and add to the mushrooms with the thyme. Season.
Step 2
Slice the polenta into 16 pieces, about 1cm (1⁄2in) thick. Heat the oil in a non-stick frying pan and, in batches, fry the polenta on each side for 3-4min or until golden.
Step 3
Arrange two slices of polenta per person on each plate, top with the sauce and drizzle with truffle oil (if using). Garnish with fresh thyme sprigs, if you like, and serve.
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