Food, dogs, gardening, books.
Oh, I was soooooo wrong! I guessed egg yolk.
I still don't know what it is! Weird, seaweed caramel? An errant blob of sea snot?
It's Nereocystis luetkeana, a kind of kelp. Nereocystis means "mermaid's bladder," which is kind of funny. The bladder is full of carbon monoxide, which helps the plant float above its long anchor.