Classic Potato Salad

Hard-boil 4 eggs; peel and separate yolks from whites
3 lb Yukon Gold potatoes boil & chop
potatoes
toss, cover
& chill
from 4 eggs hard-boiled egg yolks mash yolks,
make dressing
1 cup mayonnaise
1/4 cup buttermilk
2 Tbs. yellow mustard
to taste pickle juice, a splash
salt & pepper, to taste
from 4 eggs hard-boiled egg whites, chopped
2 ribs celery, chopped
1/4 cup red onion, chopped
2 dill pickles, finely chopped