INGREDIENTS
1/2 cup
Celery
1/2 tbsp
Garlic
1/4 cup
Parsley
1/2 cup
Red onion, small
2 1/2
lbs Red potatoes, large
1 tbsp
Tarragon, fresh
3/4 cup
Mayonnaise
1 tsp
Mustard powder
1/2 tsp
Black pepper, freshly ground
1 tsp
Kosher salt
3 tbsp
Cider vinegar
3 tablespoons fine chopped cornichons