Wash the mugwort thoroughly and remove excess water.
Separate the egg whites from the yolks.
Whisk the egg whites until stiff peaks form.
Mix sugar and salt into the yolks, then add mugwort and milk, and blend well.
Fold the egg white meringue into the yolk mixture in several additions.
Heat a pan over low heat with butter.
Pour the batter into the pan, cover with a lid, and cook on low heat.
Once the surface is cooked, transfer to a plate.