Ingredients

• 1/2 (15 ounce) can mackerel fillets, drained
• 1 clove garlic, crushed
• 2 tablespoons tomato paste
• 1 1/2 tablespoons olive oil
• 1 tablespoon chopped fresh basil
• 1 teaspoon salt
• 1 teaspoon freshly ground black pepper
• 1/2 pound roma (plum) tomatoes, chopped
• 1/2 cucumber, peeled and diced
• 1 small onion, chopped
• 1 head soft lettuce (Boston, Bibb or mixed baby greens)