Enrails— bone marrow, heart.
Bone marrow, beef bone marrow, just buy beef bone shank, beef shank, and air fryer the bone marrow for 10 minutes at 400°, the default setting, and scoop it out with chopsticks or a small spoon!
Apparently Achilles as a child, was educated by Chiron— a centaur, and fed bone marrow and animal enrails (aka, organ meats).
Also a thought; maybe the best way to educate our children is through private tutors, like Marcus Aurelius, he was taught by a private tutor, not a “school“— which essentially seems to be some sort of free daycare for kids, or paid.