This is based on a version served at Beddingtons in Amsterdam. Jean Beddington serves it with a roasted red pepper salad, dressed in a little red wine vinegar and olive oil. As she says, this gives a nice complementary smoky sweetness with the eel.
Choose a small terrine, capacity 1½pt / 850ml, and line it with the fillets. If they are thick, place them between two sheets of cling film and flatten them carefully by beating with a mallet or ro