Rinse the maties, dab dry and cut off the hind fins. Cut the maties into bite-sized pieces. Cover and put them in a cool place.
For the red wine stock: Peel and halve the onions and cut them into thin strips. Coarsely crush peppercorns and cloves in a mortar. Boil up with wine, vinegar, sherry, onions, 125 g sugar and bay leaf and simmer for about 2 minutes.
Let it cool down. Pour the stock over half of the matie. Cover and leave in the refrigerator for at least 2 days.
For the dill cream sauce: Peel and finely dice the onions. Mix sour cream, crème fraîche and onions. Season with salt, pepper, 1 pinch of sugar and lemon juice. Wash the dill, dab dry, cut finely and stir into the cream.
Mix with the remaining matie. Cover and leave to stand in the refrigerator for at least 2 days.
Serve the Swedish bites separately in small bowls. Farmhouse bread or jacket potatoes taste good with them.