Traditional Hardtack and Improved Hard Tack

I decided I would try to improve the original recipe by adding a egg yoke for more fat calories and vitamin c
(after further study, I realized adding the egg will cause a hard tack to spoil much quicker. Therefore adding egg is not recommended. Perhaps a little bit of soybean meal would be better.after further study, I realized adding the egg will cause a hard tack to spoil much quicker. Therefore adding egg is not recommended. Perhaps a little bit of soybean meal would be better)
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