¼ pound haricots verts or thin green beans, trimmed
¾ cup crème fraîche
1½ tablespoons whole-grain mustard
Directions
Preheat the oven to 400˚ and position a rack in the center. In a medium bowl, combine the Yukon Gold and fingerling potatoes with 1 tablespoon of the olive oil and the garlic, sage and thyme. Season with salt and pepper.
Arrange the Yukon Gold potatoes on a large baking sheet and roast for 15 minutes. Add the fingerling potatoes to the baking sheet and roast until all the potatoes are golden brown and fork tender, about 25 minutes longer. Let the potatoes rest until they're cool to the touch.
Meanwhile, make the vinaigrette: In a small bowl, combine the shallot with the vinegar and let stand for 10 minutes. Whisk in the remaining 3 tablespoons of olive oil and set aside. Bring a medium saucepan filled with water to a boil and cook the haricot verts until crisp-tender, about 2 minutes. Rinse under cold water, drain and let cool to room temperature before tossing with the vinaigrette.
Peel the potatoes. Quarter the Yukon Gold potatoes and halve the fingerlings. In a medium bowl, whisk the crème fraîche with the mustard. Add the potatoes and toss to coat. Transfer the potatoes and any excess dressing to a serving bowl. Top with the haricots verts and serve immediately.