This recipe is from Jack McDavid, a wonderful chef in PA. I have made this very pretty colorful salad with red potatoes too.
Heat the grill to high.
Wrap the potatoes in heavy duty tin foil, in 3 batches (sweet, purple, Yukon) grill 35 minutes until tender.
Remove from foil, and cool, cut into 1 inch chunks.
Mix mayo, lemon juice, mustard and celery seed.
Add potatoes and scallions, toss.
Season with salt and pepper.
Can be refrigerated but serve at room temperature.
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