How to peel and seed a tomato
First, slice an "x" across the blossom end of the tomatoes; this will help the skin to peel off in a regular fashion.
Next, plunge the tomatoes into barely boiling water, stem-side down, for 30 seconds.
Turn the tomatoes once so that they heat evenly, allowing the tomato's skin to pull off in large strips.
Using tongs, move the tomatoes to a bowl of ice-water to stop the cooking; the tomatoes will be very hot to the touch, but the interior flesh will not be cooked.
When the tomatoes have cooled -- after 3 to 5 minutes -- remove them from the ice bath, pat them dry with a paper towel and gently peel the cooked skin off along the "x" where the skin has naturally split.
Next, with sharp knife, cut the tomato into quarters and remove the seeds, being sure to cut away the core on the stem end.
Once the seeds and skin have been removed, you're left with tomato flesh petals that can be used to hold dollops of tuna or vegetable salad, or diced and added to soups, salads and sauces.