Original Knox Blox

4 envelopes Knox? unflavored gelatine
3 small boxes fruit flavor gelatin
4 cups boiling water

In a large bowl, mix unflavored gelatine with fruit flavor gelatin, adding boiling water. Stir until gelatine is completely dissolved. Pour into a 13 x 9-inch baking pan and chill until firm. To serve, cut into 1-inch squares.