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Prepare the tomato sauce: caramelize the garlic in olive oil in a pan, add the onion and fry for 5 minutes, then add the tomatoes, crush them lightly, and cook for another 20–30 minutes over low heat.
Prepare the tomato sauce: caramelize the garlic in olive oil in a pan, add the onion and fry for 5 minutes, then add the tomatoes, crush them lightly, and cook for another 20–30 minutes over low heat.
Spread the tomato sauce in a baking dish.
Place the frozen gyoza dumplings and feta cheese on top of the sauce.
Bake in the oven at 180ºC for 10 minutes.