Heat a tablespoon of olive oil in a frying pan over a medium/high heat. Add the mackerel and fry for 3-4 minutes until golden. Flip and cook for a further 1-2 minutes or until the fish is completely cooked through. Flake the fish into bite sized pieces and set aside.
Step 2
Add the spinach to a salad bowl. Dice the tomato, avocado and onion. Add to the bowl with the spinach and toss to combine.
Step 3
Add the flaked mackerel, lime juice, remaining olive oil, salt and pepper. Toss well to combine.