Peel and finely dice 1 onion. Heat 20 g fat in a pot and fry the onions in it until they are glassy. Add rice, sauté briefly and add a good 1/2 litre of water. Add stock cubes and bring everything to the boil.
Cover and allow to swell for approx. 40 minutes over a low heat. In the meantime clean and wash the vegetables. Cut the peppers into pieces. Quarter the aubergine lengthwise. Halve the zucchini and cut both into slices.
Cut the tomatoes into slices. Peel the remaining onions and cut into slices. Heat oil in a pot and braise the vegetables - except the tomatoes - in it. Add the tomatoes. Season with salt, pepper and herbs from Provence.
Add 3/8 litres of water. Stew vegetables for about 15 minutes. Put the rice in a bowl and let it cool down a bit. Crumble toast finely. Mix with eggs and cheese into the rice. Heat some remaining fat in a frying pan and add small heaps with a tablespoon.
Press slightly flat and fry on both sides for 4-5 minutes over a moderate heat until golden brown. Gradually bake 16-20 biscuits. Season the ratatouille again with salt and pepper and arrange on plates with the rice cookies.
If desired, sprinkle with fresh thyme and garnish.