Put about 2 liters of water in a sufficiently large saucepan. Add the lemon slices, onion slices, bay leaves, juniper berries and cloves. Then pour in the vinegar and white wine. Cook the whole thing for about a quarter of an hour.
Now add the fish and let it steep for 30 minutes (do not boil).
I recommend boiled potatoes, melted butter and fresh lemon wedges as a side dish.