Process the strawberries into a puree (blender or hand blender) and divide between four dessert glasses.
Melt the chocolate in a hot water bath and stir in the milk. Let cool slightly.
Beat the egg white until stiff and fold 1 tablespoon into the liquid chocolate. Carefully fold in the remaining egg whites.
Spread the mousse on the dessert glasses with the strawberry puree. Put in the fridge for at least 2 hours to freeze. Before serving, take the two remaining strawberries for decoration.