Instead of bread, this sandwich uses cabbage egg pancakes, with a filling made from eggs inside the pancakes.
Beat one egg to make egg wash, then add shredded cabbage and one teaspoon of salt, and mix well.
Add oil to a frying pan and pour in the mixture to make a cabbage egg pancake.
Cut the cabbage egg pancake into the shape of a slice of bread (optional).
Separate the whites and yolks of a hard-boiled egg. Chop the whites and mash the yolks.
Combine the separated egg whites and yolks with allulose and mustard, or sriracha (you can use both), to make the filling.
Place the egg filling inside the cabbage egg pancake and enjoy.