Slice the scallions, using the white and the green.
Cook
Place the chicken broth, water, two tablespoons of the vinegar, and black pepper in a saucepan and bring to a boil.
Add the potatoes to the broth mixture and bring it to a boil once again. Cover the pot, reduce the heat to medium, and cook the potatoes for 10 to 15 minutes or until they are tender when pierced with a fork.
Remove the potatoes from the broth and place them in a salad bowl.
Dressing
While the potatoes are simmering, prepare the dressing.
If using unstrained yogurt, strain the yogurt in a cheesecloth lined strainer. Place the strainer over a bowl to catch the liquid. Let the yogurt drain for 15 minutes.
Discard the whey, dry the bowl, and place the yogurt in the bowl.
Add mayonnaise, dill, and remaining vinegar to the yogurt. Whisk dressing until it's well mixed.
Combine Ingredients
If you plan to enjoy the potato salad cool, let the potatoes cool before combining the ingredients. If you want to enjoy a warm salad, full steam ahead!
To the bowl with potatoes, add the peppers, tomatoes, and scallions.
Pour the dressing over the vegetables and toss until the salad is well blended.