"You can roast the potatoes and make the mayonnaise a day ahead; combine them just before serving...."
INGREDIENTS
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4 pounds red-skinned potatoes
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1 cup canola oil
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2 tablespoons chopped fresh rosemary leaves
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1 1/2 teaspoons salt
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For the Mayonnaise:
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1 tablespoon fresh lemon juice
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2 teaspoons dijon mustard
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2 large egg yolks
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1/4 teaspoon freshly ground black pepper
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1/2 cup chopped scallions (mostly white, with 1 to 2 inches of green)