The Lord Said: A Scummy Pot.

Ezekiel 24:1 Thus says the Lord God: “Set on the pot, set it on; pour in water also; put in it the pieces of meat, all the good pieces, the thigh and the shoulder; fill it with choice bones.
5 Take the choicest one of the flock; pile the logs under it; boil it well; seethe also its bones in it. 6 “Therefore thus says the Lord God: Woe to the bloody city, to the pot whose corrosion is in it, and whose corrosion has not gone out of it! Take out of it piece after piece, without making any choice...10 Heap on the logs, kindle the fire, boil the meat well, mix in the spices, and let the bones be burned up. 11 Then set it empty upon the coals, that it may become hot, and its copper may burn, that its uncleanness may be melted in it, its corrosion consumed.

The Lord was going to turn up the heat. Historically, Jerusalem was now in its final siege. The meat was boiled till the bones fell off, and they were then added as fuel for the fire.  Then, the pot was allowed to burn dry, baking the scum onto the pot. There would be no water left; the final meal was gone; all that would be left was the scum on the pot. So would be the judgment on Jerusalem for her persistent sin.