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Set a rack on the bottom of a cookie sheet. Place a sheet of parchment paper over the rack. Let the fruit freeze overnight.

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Take a low-lying metal rack and set it at the bottom of a cookie sheet. Try to center the rack so that it remains steady whenever you transport the baking sheet. While this step isn't required, the rack will help keep the cherries from moving around too much on the baking sheet. Cut off a long piece of parchment paper and stretch it over the rack. Try and roughly match the dimensions of the cookie sheet so the rack is covered completely. If your parchment paper container comes in a box with a cutter built in, unroll it over the baking sheet so you can measure it as you go. If you don't have parchment paper on hand, try using wax paper instead. Place the baking sheet in an empty shelf or corner of your freezer where the fruit won't get crushed. Leave the cherries in the freezer overnight, or for at least 4-6 hours. If you're in a rush, check on the cherries every 4 hours or so to see if they're firm.