- "A dish gone awry after adding the wrong ingredient. Chewing your way through this won't be fun, but it will fill you up when you're between a rock and a hard place."
- — In-game description
The Rock-Hard Food is an item from The Legend of Zelda: Breath of the Wild. It is a curative item that restores Link's health with some Heart Containers. Link can cook it by using one of several non-conventional ingredients such as Flint, Luminous Stone, Amber, Diamond, Opal, Ruby, Sapphire, Topaz or Wood.
It is one of two failed dishes that result from using incompatible ingredients along with Dubious Food. In early beta builds and demos of Breath of the Wild there was a third failed dish called Failed Experiment.
When cooking this food, the puff animation is not the usual one but a not-so appealing one, made out of smoke and sound of breaking glass indicating failure. As its name implies, Link has visibly hard time chewing Rock-Hard Food when he consumes it, though it will not hurt him but restores a few heart containers.
Link's ability to consume Rock-Hard Food safely without breaking his teeth may be due to being treated to Rock Roasts by Daruk in the past due to his unfamiliarity with Hylian dietary needs which is mentioned in Daruk's Training Journal. It is noted by Daruk that Link managed to consume a Rock Roast presumably in the same manner as Rock-Hard Food.
Near the Ishto Soh Shrine, Link encounters Moza a female Hylian chef who apparently specializes in making failed dishes. She will teach Link recipes to improve health restoring effect of failed dishes by using certain incompatible ingredients. She has even named her recipes despite explicitly resulting in either Dubious or Rock-Hard Food.
She has a single recipe for Rock-Hard Food which she calls "Lavish meat dish". It is prepared by cooking either Raw Meat or Raw Bird Drumstick with Gemstones (Luminous Stone, Amber, Opal, Topaz, Ruby, Sapphire, or Diamond). Unlike the others, this recipe will not increase the amount of hearts restored.
In early beta builds and demos of Breath of the Wild featured an item called Failed Experiment which used the same icon as Rock-Hard Food but had a slightly different description but was also a failed food dish. Given the similarities it is likely Failed Experiment was a beta version of what eventually became Rock-Hard Food similar to how the beta Sailcloth evolved into the Paraglider.