Clean mushrooms, quarter them. Peel and chop onions and garlic. Fry half the garlic and half the onions in 1 tablespoon butter. Add frozen spinach and 5 tbsp. water, bring to the boil. Steam covered for 8-10 minutes.
Season with salt and pepper. Boil eggs for about 7 minutes. Roast sesame seeds and take them out. Fry mushrooms and rest of garlic in hot oil. Season with salt and pepper.
Fry the rest of the onions in 1 tablespoon butter. Steam oat flakes briefly. Add 600 ml water and stock, bring to the boil, then allow to swell for 4-5 minutes. Season with salt and pepper. Rinse, peel and halve the eggs. Arrange everything,