Shavu'os

I'm putting this up in the hopes that someone can help me make something useful about it. I pointed out to my shiur that the mitzva to place lamb between two pieces of bread is well known on Pesach, according to Hillel. Less well known is that the same mitzva pertains to Shavuos. Answer- the tnufa of the kvasim between the Shtei Halechem, both before and after shchita. That's fine, and clever enough, but it would be so much better if I could figure out a way to say that there's also such a concept on Sukkos. So far, nothing.