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Step 1
Pour lemon mix into a medium bowl and add 2 cups boiling water. Stir until dissolved, then let cool until warm but not steaming hot, about 10 minutes. Gradually whisk in sour cream until smooth.
Step 2
Spray a 10- or 12-cup mold or Bundt pan, preferably nonstick, very lightly with neutral cooking spray. Blot any extra oil with paper towels. Pour in lemon-sour cream mixture and refrigerate until set, about 1 hour.
Step 3
About 15 minutes before lemon-sour cream mixture has set, pour cherry mix into a large bowl and add 2 cups boiling water. Stir until dissolved, then stir in cherry or cranberry juice. Make sure mixture has cooled to lukewarm at most before proceeding.
Step 4
When lemon-sour cream mixture is set, gently ladle the cherry mixture over it. Don’t pour it on top, as the mixture breaks easily. Refrigerate again until completely set, at least 3 hours or overnight. (If you want to create multiple thinner layers of Jell-O, as seen in the picture here, instead of just one layer of each flavor, see Note.)
Step 5
When ready to unmold, run the tip of a sharp knife around the edge of the pan to break the seal. Dip the bottom half of the mold in warm (not hot) water for 15 seconds. Place a serving plate over the top and flip to unmold. (If the mold doesn’t come out immediately, don’t shake it; try the warm water treatment again, 15 seconds at a time, until it comes out. If you leave the mold in the water for a longer time, it may start to melt.)
Step 6
Just before serving, garnish, then slice, using a sharp knife and wiping the blade between slices.