This is not even a recipe, as it's so easy - but I include it because I have seen people buying jars of tuna sandwich filler etc... and it is so easy, and more delicious to make it yourself. To a can of drained tuna add chopped spring onion, celery, roast red pepper, cucumber, radish and gherkin. Mix in 1 spoon of mayonnaise and one spoon of natural yogurt, grind on black pepper.... easy, incredibly quick and delicious - and people buy this stuff at great expense from the chiller compartment. Use as sandwich filler, baked potato topper or on its own. Victim had breadsticks, and says it's yummy.