Wash the mugwort thoroughly and remove excess water.
Mix eggs, milk, and sugar well in a bowl.
Chop the mugwort finely and add it to the batter, then mix.
Pour the batter into an oven-safe dish and bake in a preheated oven at 170°C for 20 minutes.
Combine whole wheat flour, oatmeal, butter, and sugar to make the crumble topping.
After 20 minutes, take the pudding out of the oven and add the crumble on top.
Put it back in the oven and bake for an additional 10 minutes.