I think it was lotus seed paste...colored green. I took some bites of the yolk but didn't like it much so I threw it out.
And...um, I ate the rest of the mooncake. THE WHOLE THING. I was under the impression after reading so much about mooncakes that people only eat a quarter or so because due to the (caloric) density, that's all you need to feel satisfied. But I ate half, felt about the same as I did before eating it, and then i ate the other half and still felt okay. I don't feel stuffed, but mentally I'm thinking, "Damn, I wasn't supposed to eat the whole thing, but I did."
I'll admit that I'm not proud of eating the whole thing, but what's wrong with my stomach? Why doesn't it sense fullness? (pokes it) Ugh. I suppose I should fast tomorrow but i have a lot of fruit and you know that's not going to happen. I only fast when I have no food around.