Cut the yellow beets into pieces of the same size and not too small. Cover with broth and bring to the boil. Add onions, garlic and a little oil. Check the boiling degree of the yellow beets more often, they should definitely still have bite inside.
Then take the yellow beets out of the broth and let them cool down.
Reduce the brew a little and season well with salt, pepper and vinegar. Once cooled, pour the brew onto the yellow beets and let it steep.