Preheat Oven at 200’C for 5-8 minutes. Place the potato in a oiled oven tray; middle rack and cook for 20-25 mins. Meanwhile, Melt the garlic butter on a medium-high heat. Add ginger purée, lemon juice, chilli pepper, and 5 spice; mix in and then add the king prawns (and drizzle of sesame oil-optional)and sauté for 3-5 mins.