Reduce strong consommé so that when cold it will be jelly-like in consistency. Set individual moulds in pan of ice-water, pour in consommé one-fourth inch deep; when firm, decorate bottom and sides of moulds with cold cooked carrots, beets and potatoes cut in fancy shapes. Add consommé to cover vegetables, and as soon as firm fill moulds two-thirds full of any cooked vegetable that may be at hand. Add consommé by spoonfuls, allowing it to become firm between the additions, and put in enough to cover vegetables. Chill thoroughly, remove from moulds, and arrange on lettuce leaves. Serve with Mayonnaise Dressing.