You can dip fruit into an uncursed potion of water to squeeze its juice out and turn it into a (maybe diluted) potion of fruit juice. However, this could be abused if fruit juice is smoky.

An option to set the name of your juice potions, separate from the fruit, so that you can have your fruit being e.g. “pizza” without potions of juice tasting like “pizza juice”. If this option is unset, the juice name defaults to the configured fruit name.

On Easter, randomly generated user-nameable fruits will generate as “easter egg” rather than slime mold or whatever the user has customized them to be. Despite the name, it remains the exact same item in game and does not break vegan conduct.

Calculating whether a given day is Easter is a complex but solved problem; see here.

Trees can rarely drop slime mold “fruit” when kicked.

Slime mold as a new F monster, which is guaranteed to drop a slime mold comestible on death.

Fruits can be applied to create potions of fruit juice.

You can dip fruits (slime molds) in a potion of acid (or potion of water?) to turn it into a potion of fruit juice (consuming the fruit).

Add a “fruit” database entry: “They say this is edible. Some adventurers have strange tastes.” and tweak the database code to recognize a typed-in fruit name in the game as this entry.