He was talking about using frozen vegetables to cool his balls post-surgery. Not the most appetizing thought.
And you've kidney issues walkie? definitely avoid them then, it isn't all that widely known, but star fruit can quite easily be lethal in people with kidney issues, the active compound, caramboxin is a glutamatergic neurotoxin acting as an orthosteric agonist at AMPA and NMDA type ionotropic glutamatergic receptors, both are excitatory when activated, and normally, play a critical role in learning and memory, but when overstimulated, the three types of ionotropic glutamate receptor can also cause a process known as excitotoxicity, which, simply put, overstimulates the neurons involved to death.
Exact effects depend on which of the three ionotropic glutamate receptor types are involved in excitotoxicity, although seizure is common to all three, in the case of AMPA receptor direct agonists, its particularly nasty, a good example would be domoic acid, produced by certain marine planktonic organisms, and ends up in filter-feeding molluscs, being concentrated up the food chain, shellfish people eat, and it causes what is known as amnesic shellfish poisoning, and those it doesn't kill, are often left permanently screwed, permanent short-term amnesia among other, even less pretty sequelae.
https://en.wikipedia.org/wiki/Amnesic_shellfish_poisoningIn cases of star fruit toxicity, patients who exhibit seizure usually do not survive, as it progresses to a fulminant encephalopathy.
Primarily affects those with bad kidney function, as mentioned, but it can also poison healthy folk at times, and being packed with oxalates and oxalic acid, which themselves, damage kidneys in excess, smaller amounts of oxalate/oxalic acid can be tolerated by most, it's quite widely present in many plants, but too much is toxic to the kidneys, and in higher quantities, can also be cardiotoxic IIRC. There's a fair bit in rhubarb for example, less in the stalks, but the leaves can be fatal if eaten.
, and quacks like a 