Digital Exploration of Interior Design - S3-E13
Continuity mistake: Britta sets down her copy of 1984 and her pen, which is angled with the end pointing away from the book. Two cuts later, the pen is now parallel with the book, without Britta ever touching it.
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