Fresh tortellini, small pasta parcels containing meat, cheese or vegetable fillings, are now available in most supermarkets and delicatessens, making this delicious dish very easy to put together.
Over low heat, melt the butter in a frying pan and cook the shallots with a pinch of salt for 3-5 minutes without colouring. Toss the mushrooms in the lemon juice, add to the pan with another pinch of salt and cook over medium heat for about 10-15 minutes, or until the mushrooms are dry and all the liquid has evaporated. Add the port and cook for 2-3 minutes, or until almos