Place the beets in a large pot. Cover with cold water and season with salt. Bring to boil. Cover and cook over medium heat until the beets are tender, about 1 hour. Drain and rinse under cold water. Peel and cut each beet into 6 to 8 wedges. Set aside, keeping the colours separated in two bowls. Cover and refrigerate until completely chilled, about 1 hour. Before assembling the salad, pat the beets dry. Season with salt and pepper.