The most favorite okroshka comes from childhood - of course, okroshka with doctor's sausage! Build a time machine and make this incredibly easy soup with a dash of grainy French mustard.
Grate the yolk on a fine grater. Add olive oil, grainy mustard and mix.
Cut vegetables. Put in a plate and pour yogurt. Top with mustard sauce.
Serve with a white baguette with doctor's sausage, mustard and sour cream.