Boil the wammerl with the onion, the carrot, the garlic clove and the spices in salt-vinegar-water for about 45 minutes and allow to cool in the stock.
Thinly slice the meat and layer in a bowl. Spread the onion rings from the red onion on top. Degrease the meat stock and season some of it with salt, sugar, pepper and vinegar and pour over the meat and onion mixture.