the pressure cooker then pan fried and smothered in gravy.
That's it right there. Sometimes, T alone is not enough to break down muscle tissue. You gotta add P to T.
Had to leave the heads on, GP and an aunt liked the brain,
Brains are mostly composed of neurons (aka 'nerve cells'), and many of those are coated in myelin, which is extra fat. That is, the brain has HUGE amounts of fat.
Now, for almost a century, we've been told that fat is bad for us, that the key to health is low fat, high carbs.
It's turning out that was as wrong as smoking is good for you.
The new version is, low carbs (< 50 g/day), moderate protein, high fat.
It's the ketogenic diet: high animal fat: bacon, eggs, butter, duck, lard, nuts, marbled ribeye with the fat still on ... brains.
Veganism kills. Poetic justice in some way.