In a large bowl, soften gelatin in 1/2 cup soda. In a small saucepan, bring remaining soda to a boil. Remove from the heat; add to gelatin mixture and mix well. Stir in flavored gelatin; until dissolved. Add anise.
If necessary, skim foam. Pour into a 13-in. x 9-in. pan. Chill until firm. Use small star-shaped or other holiday cutters or cut into 1-in. squares. Store in the refrigerator.