1-2x Argopelter Eggs are obtained by chance when Butchering an Argopelter. The chance of receiving this item increases once you've learned the Viscera & Bits Skill. An Argopelter Egg restores the Domesticated Meat Food Group by 15% with a 85% chance when used as Any Poultry Egg in a Food recipe. Additionally an Argopelter Egg can be boiled in a Clay Pot, or Copper Pot, or Cauldron to make a Hardboiled Egg. An Argopelter Egg can be stored in an Egg Basket.
Raw Egg Yolks
Right-clicking on Any Poultry Egg and selecting "Crack Shell" will give you Raw Egg Yolks and an Egg Shell. An empty Vessel, or one already containing Raw Egg Yolks, must be in your Inventory when Cracking Any Poultry Egg, otherwise the Raw Egg Yolks will be lost.
When cracked, an Argopelter Egg yields .60 liters of Raw Egg Yolks.