Wash, dry and finely chop the herb bunches. Peel onion and chop finely. Heat some oil in the pan and season the schnitzel with salt and pepper and fry, remove and keep warm.
Steam the onion in the same pan until translucent. Add diced garlic cloves and deglaze with broth. Let simmer briefly. Stir in the crème fraîche, mustard and herbs and simmer for about 1 minute.