Put rice into boiling salted water and let it simmer for about 20 minutes. Carve tomatoes crosswise, blanch with boiling water, rinse and peel the skin. Quarter 1 tomato, remove seeds and cut into strips.
Cut the rest of the tomatoes into pieces. Clean and wash spring onions and cut into rings. Heat 1 teaspoon of oil in a saucepan. Fry the tomatoes and white spring onion rings in it. Add tomato paste, pour on vegetable stock, bring to the boil and simmer for 5 minutes.
Knead minced meat with egg yolk, season with salt and pepper. Form small balls from the minced dough. Heat 2 teaspoons of oil in a pan. Fry the balls in the oil for about 5 minutes. Drain the rice and let it drain.
Add meatballs, rice, spring onion green and tomato strips to the soup. Season again with salt and pepper.