Finely chop the dill.

Mix together the mustards, honey, and dill. Season to taste with salt.

Take the fish out of the pickling liquid. Discard the liquid and any vegetables.

Mix the pieces of fish in the mustard mixture, ensuring every piece is well coated.

Pour the mustard herring into a clean jar and place it in the fridge.

For best results, let it marinate for 24 hours before serving.