Bring 600 ml of water to the boil in a pot, stir in the stock. Add rice, bring to the boil again and simmer for 25-30 minutes.
In the meantime, drain the canned tomatoes and collect the juice. Chop the canned tomatoes. Halfway through cooking, add the canned tomatoes and juice to the rice, bring to the boil again and finish cooking.
For the sour cream mix frozen herbs and sour cream. Wash parsley, shake dry and cut into fine strips.
Wash the fresh tomatoes and dice them finely. Add tomatoes to the rice, heat briefly and season to taste with salt, 1 teaspoon sugar and vinegar. Sprinkle with parsley. Serve with a dollop of sour cream.
Add the rest.