Remove the stem from the tomatoes and cut them in half horizontally. Scoop out the insides of the stemless halves with a spoon and set aside. Dice the remaining tomatoes into 1cm cubes and combine with the scooped-out insides. Mince the onion and divide into two portions. Mince the garlic after removing its core.

Cut the melting cheese slice into quarters.

In a bowl, mix the ground meat, half of the minced onion, garlic, and the Hamburg seasonings. Divide into two portions and shape into patties. Stuff the patties into the hollowed-out tomatoes and shape them neatly.

Place the stuffed tomatoes on a heatproof dish and top each with cheese. Bake in a preheated oven at 200°C for 15 minutes until cooked through.

In a frying pan, heat the remaining tomatoes and onion over medium-low heat. Add the tomato sauce seasonings and simmer for 8-10 minutes until the liquid evaporates and the sauce thickens.