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Try this Natural Fruit Juice Knox Blox recipe, or contribute your own.
In bowl sprinkle gelatine over cold juice; let stand 1 minute. Add hot juice and stir until gelatine is completely dissolved. Pour into 9x13-inch pan; chill until firm. Cut into1-inch squares. Makes about 9 dozen. Variation: for Knox Blox with flavored Jello, omit fruit juice. In bowl, mix unflavored gelatine with 3 packages(4 serving size each) fruit flavored or sugar free Jello; add 4 cups boiling water and stir until gelatine is completely dissolved. Chill and cut as above.