I forgot to mention "fill the larger bag with the egg whites" then seal it and cook it a second time!

These are real. I saw a TV show about how they are made. First seperate a ton of eggs. then scramble the yokes and pour them into long flexible plastic bags. These are steam cooked. Then they squeeze the cooked yokes out, cut them to size and put them in a second bag (which is a larger diameter)exactly the size shown in the photo. The new bag is sealed and steam cooked a second time. The process was developed of food caterers who needed thousands of perfect egg slices for a nice presentation.