broth
臛 centers on a rich, savory liquid made by simmering ingredients: broth. It is a specific culinary term for the flavorful liquid base of soups and stews.
臛 combines the flesh radical ⺼ with 霍, which likely contributes the sound. The character is rare and its exact historical development is uncertain.
The flesh radical ⺼ suggests meat, and 霍 looks like a complex cooking vessel. Picture meat simmering in a pot, releasing its essence into a rich broth.
For コク, imagine a cook tasting the broth: cook -> コク, and the cook checks the flavor of the simmering liquid.