Nothing ti known to make your penis harder buy eating, hardness is determined by how aroused you are. though if your having trouble getting it up you may be suffering from erectile dysfunction
Land dwelling animal's eggs have shells (hard or soft) to keep them from drying out. Fish eggs don't need shells because being in water they won't dry out.
First, if the skin is very thick, try first using an item on the market (you can find them at Walgreens) called the "Ped Egg". That will "shave" off some of the thickness and get you back to nearly...