I regularly cook kidneys at home too, and liver, especialy with onion gravy and mashed potatoes which ... a menu I will always order them. Now, to tripe. I was brought up in the Midlands, and ...

Add tomato, tripe and curry leaves ... Add water, a little at a time, when necessary and depending on how much gravy you like. Season to taste and sprinkle with a teaspoon of garam masala.