Skin and roughly dice tomatoes. Finely dice the shallot and sauté in oil in a large saucepan. Add diced tomatoes, canned tomatoes and tomato juice, mash everything lightly and simmer for 10 minutes on a low heat.
In the meantime, mix the minced meat, egg, breadcrumbs, mustard and minced meat seasoning and form very small meatballs out of them (about 2 cm in diameter). Puree the tomato soup and add meatballs. Let simmer for about 5 minutes. Carefully stir in instant rice, simmer for another 2 minutes. Season to taste with salt and pepper.