add beets and 2 litres of cold water and pitch of salt.
let them to boil until cook well, then let them cool.
slice each beet into thin slices and here you should add drops of lemon juice on your knife to maintain beet's colour.
slice 1 large white onion into slices . then make layers from beet slices and onion
in small bowl mix lemon juice with olive oil and season with salt and pepper then pour this mixture ton salad .
use fresh parsley for garnish