Best Deli Potato Salad

This is said to be "the best of the best"
of the varied potato salad recipes out there!

Ingredients:
Salad:
1 pound small red potatoes, peeled and cubed
1 small sweet red pepper, cored and diced
1/2 cup celery, diced
3 shallots, chopped fine
1/4 cup chives, chopped

Dressing:
1 tablespoon lemon juice
1 tablespoon tarragon vinegar
1 1/2 teaspoon dijon mustard (more?)
1 clove garlic, minced
1/4 teaspoon salt (or to taste)
1/4 teaspoon ground pepper (or to taste)
1/4 cup chicken stock or broth
1 tablespoon olive oil
3 tablespoons various minced herbs (basil, chervil, tarragon, etc)
2 tablespoons sour cream
1 teaspoon mayonnaise (low fat?)
1/2 teaspoon white horseradish (optional)
1/2 teaspoon dill weed

Directions:
Place potatoes in a steamer basket,
set in boiling water 10 minutes,
until tender, not mushy.
Placed drained potatoes in a large bowl,
add pepper, celery, shallots, and chives.
In a separate bowl whisk together all
the dressing ingredients, one at a time.
Whisk until well blended (or place in a jar and shake).
Pour into a large bowl and toss.