In a saucepan, cover the beets in water and add 1 teaspoon of salt. Bring to a boil. Lower heat and cover for 40 minutes. Drain and cool.
Dice the beets and slice the red onion and add them to a salad bowl.
Mix the dressing well and drizzle all over the beets, toss, and serve!
Optional: Sprinkle feta if you wish just before serving.