Serves 4-6 Ingredients 1 medium celeriac (about 400 g) 3 medium King Edward potatoes (about 600 g) A wedge of lemon 400 ml thickened cream 6 sprigs of thyme, plus an extra 2 sprigs of thyme for garnish 1 bay leaf 10 peppercorns ¼ onion, skin removed 60 g Gruyere, thinly shaved 15 g parmesan, … Continue reading Potato and Celeriac Gratin with Black Truffle