Monday Mystery

Not too much of a problem identifying this close shot from last Monday:



as being part of:



an old cast iron trivit. Very useful to get air circulation all round things which need cooling down or defrosting slowly. Well done to Ellen D., Adrian, Ragged Robin, Dave, Kris and Kev who were close or spot on.

Another close view for this week:



Whatever can it be? Please leave any guesses in the comments. They will be revealed, along with the answer, next Monday.