Cook the tender wheat in salted water according to the instructions on the packet. Wash the tomatoes, cut off a lid and remove the seeds. Remove the pulp and set aside (still needed).
Peel the garlic and onion, cut into small pieces and sauté in a little olive oil. Chop the tomato flesh you just removed and add.
Chop the feta cheese and tuna and mix in a bowl with the pesto. Add corn, tender wheat and the onion mixture.
Pepper and salt the hollowed out tomatoes from the inside, place in a greased baking dish and fill with the wheat and tuna mixture. Spread the rest of the filling in the baking dish. Cook in a hot oven at 200 ° C for approx. 15-20 minutes.
Tip: When the cooking time is over, spread a few dots of crème fraîche on the tomatoes. This filling also tastes good in zucchini or eggplant.