- 6 ounces canned mackerel fillets in oil
- 2 hard-boiled eggs, diced
- 1 onion, chopped
- 1 tablespoon mayonnaise (optional)
- 1 tablespoon chopped fresh parsley, or to taste (optional)
- 1 pinch ground black pepper
- Drain mackerel and place in a large bowl. Add eggs, onion, mayonnaise, parsley, and black pepper; mix well to combine.