Ris de veaux is a delicacy that I cherish when I can find it on the menu in France.
I was brought up on offal, not much money and four of us to bring up. Brain fritters, kidney, liver, salted and pressed tongue, you name it, we eat it and enjoyed it.
At Uni once shared with a yank who appreciated my cooking, but once said "I don't eat organs" Ahem, that's almost everything that I cooked. Black pudding, haggis, (a favourite) liver, kidney, tongue in a cheese and onion toastie plus apple sauce on top with egg soaked into the homemade bread. Stuffed heart.
My aunt used to make brawn from a split pigs head which was great.
Pots of dripping with the brown goo at the bottom spread on toast for breakfast. Can't get it any more.
Still bring back pots of rillettes for a guilty pleasure, even confit my own birds (pheasant not so great, guinea fowl better)
Then simple stuff like cassoulet, lob it all into a slow cooker then feast on it for several days.
Hunter's breakfast, liver, heart, kidney with an egg on top. Heaven.
I think that there is a great deal more in a deer carcasse that could be used, with a bit of imagination. from the testicles to the sweetbreads to the tongue, even the brain (though I am a bit off brains now thanks to scrapie, BSE, and CWD in deer)
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BTW, what's the story about CWD over here, it seems to have gone a bit silent