Ingredients
1 pound fingerling or other small potatoes
Coarse salt and ground pepper
1 1/2 pounds flank steak, patted dry
2 tablespoons plus 2 1/2 teaspoons extra-virgin olive oil
1 tablespoon chopped fresh rosemary leaves
2 garlic cloves, finely chopped
2 teaspoons balsamic vinegar
6 ounces baby arugula (6 cups)
Preparation
Heat broiler with rack in second highest position. In a medium pot, bring potatoes to a boil in salted water over high. Reduce heat and cook at a rapid simmer until tender when pierced with a knife, 8 minutes. Drain potatoes; halve lengthwise. Place steak on a broiler-proof rimmed baking sheet. Season with salt and pepper. In a small bowl, combine 1 tablespoon plus 2 teaspoons oil, rosemary, and garlic, then pour over steak, turning to coat. Broil until steak is medium-rare, 7 minutes, flipping once. Transfer to a cutting board, tent with foil, and let rest 10 minutes before slicing against the grain.
Meanwhile, in pot, heat 1 1/2 teaspoons oil over medium-high. Add potatoes, season with salt and pepper, and cook, stirring occasionally, until browned and crisp, 8 minutes. In a medium bowl, whisk together vinegar and 2 teaspoons oil; season with salt and pepper. Add potatoes and arugula; toss to combine. Serve with steak.
