Character for a beef dish

It names a beef dish in an old formal meal list.

The Liji (“Book of Rites”), a classical guide to ritual and household conduct, gives an early setting: its “Inner Rules” chapter lists 膷 with beef, sheep, and pork dishes. Dictionaries gloss it as beef broth or stew; other old entries also give “fragrant” and “growth within flesh” as distinct senses.

Why can it appear as a box?

The font may not contain this rare glyph.

If it appears as a box or blank, the font may lack its shape. The text still contains the same character; a font with the glyph can display it.