Shirley Bennett: They remind me of Sam and Diane. I hated Sam and Diane.
Annie Edison: Who are Sam and Diane?
Shirley Bennett: All right, we get it. You're young.
Annie Edison: Let's get back to Britta and Jeff.
Jeff Winger: There is no Britta and Jeff!
Pierce Hawthorne: He said, fully erect.
Britta Perry: Oh my God, you've been hit!
Jeff Winger: What? Oh no! Wait, wait... It's blood. I thought it was paint but I'm just bleeding. Talk about luck!
Answer: It was part of the plot that when the boiled yam was dropped it looked like it was stepped on (which it never was). So there was no way to tell the difference between the flesh being soft because it was boiled or because it was stepped on (in the show that is, I don't know if one could tell the difference in real life). Plus, the rest of the yam wasn't boiled, so there was no evidence the yam was sitting in boiling water.
Bishop73