Preheat oil to 375 degrees F.
Fry potatoes in batches for 5 minutes or until fork tender and golden. Remove with a slotted spoon or spider and place on a paper towel lined sheet tray.
Place the warm potatoes in a large bowl and season with salt and pepper. Mix mayonnaise, Dijon, lemon juice and parsley together in a small bowl. Fold in beets and red onion. Pour dressing over the potatoes and toss until coated.