I made Joanne's pesto potato salad, and it was delish!
I made adjustments based on what we had. I used new potatoes (purple and yellow). No pine nuts (didn't have them), no scallions (ditto), a teeny bit of red onion, and I used tarragon vinegar instead of white balsamic.
My garlic is STRONG though - holy cow.
I think my mother in law would be aghast at using new potatoes...those are to be boiled and served with dill and butter. Period. Still good though!