The Drying package allows you to add or remove Drying recipes.

You can call the Drying package using mods.tconstruct.Drying

The time is in ticks

ZenScript
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//mods.tconstruct.Drying.addRecipe(IItemStack output, IIngredient input, int time);
mods.tconstruct.Drying.addRecipe(<minecraft:leather>,<minecraft:rotten_flesh>, 100);
ZenScript
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//mods.tconstruct.Drying.removeRecipe(IItemStack output);
mods.tconstruct.Drying.removeRecipe(<minecraft:leather>);

//mods.tconstruct.Drying.removeRecipe(IItemStack output, IItemStack input);
mods.tconstruct.Drying.removeRecipe(<minecraft:leather>, <minecraft:rotten_flesh>);