Cut off ends of beets. Wash well & cook in boiling salted water until tender. Drain & remove skins under running cold water. Dice.
Mix together the dressing ingredients.
Combine beets in a salad bowl with the onion, tomato, garlic cilantro & parsley. Pour over half the dressing, toss gently & chill for 30 minutes. Slice the potatoes, place in a shallow bowl & toss with remaining dressing. Chill.
When ready to assemble, arrange beets, tomato & onion in the centre of a shallow bowl & arrange potatoes in a ring around them. Garnish with olives.