Potato and Porcini Soup with Walnut Oil
15 g dried porcini
50 g unsalted butter
500 g potatoes
2 onions
1 sprig thyme
1 lemon
2 whole garlic cloves, peeled
2 fresh bay leaves
1 litre chicken or vegetable stock
25 g parsley
300 ml milk
walnut oil
salt and freshly ground black pepper
