1. Wash potatoes. Peel and cut into small cubes.
2. Boil with salted water for 15-20 minutes, until soft. Drain well.
1. In large mixing bowl combine onions, peppers, yogurt, mustard, salt, ground red pepper, oregano, parsley, olive oil and vinegar.
2. Add cooked potato cubes and mix well.
3. Garnish with olives and capers.
4. Refrigerate until cool.