Wash the tomatoes and dry with kitchen towel.

Place them stem side down on a chopping board sso that the slightly pointy end is uppermost.

Make 3 cuts to divide into 6 segments, without cutting all the way through.

Let them drain on kitchen paper.

Finely chop the spring onions, celery and basil.

Drain the tuna and add to a mixing bowl with the remaining ingredients except salt.

Stir to combine and add salt to taste.

Divide the mixture between the tomatoes with a teaspoon..

Garnish with some salad leaves and extra basil if you prefer.