Doesn't sound too good but this is a nutritious student budget dish that I'm still tucking into 30 years later! Pig kidneys are not to everyone's taste (or smell) but I love 'em!
This is a dish I tend to cook for myself when the opportunity arises (not popular with the family) but two kidneys stretches to a two-person serving. Also quite nice cold next day with a dash of soy sauce if there's some left. And I sometimes add pulverised fennel seeds. If you get your timings right, can be knocked-up in 20 minutes.