In a large bowl, combine the tomatoes, mackerel, olive oil, lemon juice, oregano, salt, and pepper. Mix until all the ingredients are evenly distributed.
Serve the salad immediately or refrigerate until ready to serve.
Interesting Facts
Mackerel is an excellent source of omega-3 fatty acids, which are known to reduce inflammation and improve heart health.
Tomatoes are a great source of lycopene, an antioxidant that may reduce the risk of cancer.
Olive oil is a healthy fat that is rich in monounsaturated fatty acids, which can help to lower bad cholesterol levels.