Chop and mix in a salad bowl with a little olive oil , salt and vinegar. Any vinegar white wine, red wine, balsamic it all tastes great.
You can add sweetcorn, grated carrot , pasta , fete cheese > ( 79 kcal per 30g serving, 6.4g fat)anything you like to a salad.
Same applies to prawn cocktail. Except you use prawn not tuna obviously. You don’t need the vinegar but can still put it in and top with a low fat seafood sauce.
Make your own seafood sauce with mayo,salad cream, vinigar and a little tomato sauce. Adjust to taste.
Easy and yummy. xD