Wash the tomatoes and cut off the tops to use as lids. Scoop out the core and seeds carefully with a spoon
Salt the insides then place upsides down over kitchen paper to drain
Drain the tuna and flake it with a fork into a bowl. Finely chop the onion and add to the tuna with the parsley, sweetcorn, ketchup and mayo. Season to taste
https://cookpad.com/us/recipes/332798-vickys-eggless-mayonnaise-gluten-dairy-egg-soy-nut-free
https://cookpad.com/us/recipes/332955-vickys-tomato-free-tomato-pasta-sauce-ketchup-gf-df-ef-sf-nf
Spoon the tuna filling into the tomatoes, put the lids on and serve on a few lettuce leaves
You can use baby bell peppers or hollowed out cucumber instead of tomatoes
https://cookpad.com/us/recipes/338339-vickys-cucumber-salad-cups-with-fillingdip-options
