A spoon full of pancake batter in a hot pan to test the temp.
Looks like some kind of interesting mold beginning to grow....
I would not have guessed it. Luckily by the time I arrived you had posted the answer.
I'm really sorry about putting the word verification system back on but the spam comments have been filling my email box.Be patient, take your time and just refresh it if the word is too hard. You'll get a new one.