Finely chop the onions and parsley, sauté together with the minced meat in the hot fat. Season with salt, pepper, marjoram and thyme, dust the flour and add the meat stock. Let it boil down a little and finish with the cream.
Cut a lid off the tomatoes. Carefully hollow out the tomatoes and fill with the spicy minced meat mixture. Put the lid back on and place the filled tomatoes side by side in a buttered gratin dish. Spread the rest of the minced meat filling between the tomatoes, add a little more meat stock and cover the tomatoes in the oven preheated to 180 ° C for about 10 - 30 minutes.