Roast beef, done in a covered pan, releases "gravy" that appears to
consist of three main components.
One is the fat which hardens at room temperature and looks very much like
suet.
Another remains liquid or semi-liquid and relatively transparent in small
quantities. At refrigerator temperatures it seems to have a weak jelly
consistency.
The third is opaque light to medium brown and tends to cluster a bit.
My guesses are:
The first is, as it appears, fat that has liquidized and escaped from the
muscle (meat).
The second part might be the serum (liquid) part of the blood.
This would leave the cells that 'float' in the serum as the third
component - including red and white cells, etc. etc.
Am I even close?
Next question - how many of the three, and which ones would contain
cholesterol? ..... and is there any health hazard in consuming any or all
of these (aside from the need to avoid oxidized cholesterol)?
NOTE: Vegetarians, vegans, other "meat is poison" extremists are politely
invited to ignore this post.
Ben F.