Double Decker Jello Blocks
["3 envelopes Knox unflavored gelatine", "3 (3 oz. each) pkg. flavored Jell-O gelatin", "2 1/2 c. boiling water", "1 c. (1/2 pt.) heavy cream"]
["In large bowl, combine Knox gelatine with flavored gelatin. Add boiling water; stir until completely dissolved.", "Stir in cream.", "Pour into shallow baking dish.", "Chill until firm.", "To serve, cut into one-inch squares.", "Recommended pan size is 9 x 9-inch."]
["unflavored gelatine", "boiling water", "heavy cream"]