Creamy polenta mushroom ragout

Name: Creamy polenta & mushroom ragout
Ingredients: small handful dried porcini mushrooms; 25g butter; 1 shallot, finely sliced; 2 garlic cloves, crushed; 5 thyme sprigs, leaves picked; 500g large field mushroom, sliced; 200g chestnut mushroom, sliced; small glass of red wine; 125ml vegetable stock; 100g taleggio cheese (or vegetarian alternative), sliced; 500ml milk; 1 bay leaf; 3 thyme sprigs; 250g instant polenta; 50g butter; 75g parmesan (or vegetarian alternative), grated