Flake tuna and combine with beans, corn, cheese, dressing, and onions in a medium bowl. Cover and chill 1 hour.
Step 2
Just before serving, core each tomato, carefully scooping out center to within ¼-inch from edges forming a bowl; discard flesh and seeds. Drain tomatoes upside down on paper towels.
Step 3
Generously spoon tuna mixture into each of the hollowed-out tomatoes. Serve immediately.
For safe meat preparation, reference the USDA website.
For dips, make and enjoy your dip creation. Then, refrigerate within 2 hours or discard.