I've been making popover for years. But I have found that the last couple of times they didn't rise or pop, they were small, hard and a real disappointment. I've been using the same recipe for years! Not what I want to serve my family. I came to the conclusion it's the eggs! They were not fresh. Once I made sure my eggs were fresh the popovers were great! Now I test my eggs first.
All you need are the eggs and a bowl of cold water.
sinks to the bottom and stays there, it is about three to six days old.