Carve tomatoes crosswise, blanch with boiling water, let stand briefly. Quench tomatoes, peel skin. Cut out the stalk and dice the tomatoes roughly. Peel and finely dice onions.
Soak the toast in cold water. Wash the basil and chop the leaves of 3 stems finely. Heat the oil in a pot. Sauté half of the onions for 1-2 minutes, then add tomato paste.
After another 1 minute, add the diced tomatoes. Season the sauce with salt, pepper and a little sugar and simmer covered for about 15 minutes. Clean, peel and halve the cucumbers and remove the seeds. Leave bacon out in a pan.
Knead minced meat, remaining onion cubes, squeezed out bread and diced bacon and season with pepper. Fill cucumber halves with minced meat. Spread tomato sauce in 1-2 casseroles, place braised cucumbers on top. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 35-40 minutes.
Prepare rice in boiling salted water according to package instructions. Grate the cheese and sprinkle over the cucumbers about 8 minutes before the end of the cooking time. Garnish cucumbers with basil leaves and serve with rice.