Mackerel Salad

Pour boiling water over a large mackerel and let stand for ten minutes; take out and dry thoroughly by
draining on a
sieve or clean towel. Remove the head, tail and fins, and skin and bones. Shred the fish finely and mix
with one large
onion, well chopped. Add mustard, vinegar, and pepper to taste. Serve as salad, with young lettuce
leaves, and
garnish with hard-boiled eggs, sliced. This is a delightful relish with thin-sliced bread and butter.