Herrings are especially good eaten cold, and if you have them filleted you do not have to worry about the bones. If you like, you could use other white fish; John Dory is especially delicious. Serve with a salad and good bread to mop up the lovely juices.
Preheat the oven to 140°C/275°F/gas mark 1. Cut open the pepper, discard the seeds and stem and then chop the flesh very finely. Chop the capers very small and mix in a bowl with the yellow pepper, mace and cayenne pepper. Add a sprinkling of salt and stir to mix all together. Lay out