For the couscous with vegetable ragout, pour the hot soup over the couscous and cover to swell. For the vegetable ragout, cut the spring onion into thin rolls, setting aside a small part of the greenery for decoration.
Peel the carrot and kohlrabi and cut into approx. 5 x 5 mm small cubes. Cut tomatoes into small cubes as well. Fry the spring onions in oil, when they are lightly browned take them out and fry the carrot and kohlrabi cubes in the remaining oil.
Then add the spring onion again and add the turmeric. Mix everything well. Add the diced tomatoes, salt and pepper. When the liquid from the tomatoes is almost gone, pour in the vegetable soup and simmer on low heat for 10 minutes, covered.
Mix creme fraiche and flour and stir into the ragout and bring to a boil once. Serve the couscous and vegetable ragout and garnish with a spoonful of sour cream, spring onion rings and possibly a slice of lime or lemon.