Lightly whish the egg white, the stir in the icing sugar and cardamom to make a firm fondant icing. Roll the icing into 8 golfballsize balls (you probably won't need all of it). Two at a time, place the balls at opposite ends of a greased piece of baking paper, then microwave for 30-40 seconds on high untill quadrupled in size. Leave to cool for a few mins, then lift off the paper and repeat untill all the balls are cooked.
Whip the cream with half the lemon juice. Crush half the raspberries, then fold through the cream. To serve, place a little splodge of raspberry cream onto each plate. Stack a meringue with some more cream, then place another meringue on top. Spoon over more cream, then top with a few while raspberries. Dust with icing sugar and serve.