I just finished my first try of the mustard egg, and it worked well today. she pecked at the egg, and at the first taste of mustard she walked away from it. The other chickens started to eat the shell, and as soon as they got the taste of mustard they also walked away!! I plan on doing this again tomorrow and saturday. hopefully by then she will think all eggs taste this way. thank you again for your suggestion!

Hip hip hooray!