Steak Dinner

Ingredients

• 1 1/2 pounds red or Yukon gold potatoes (4 or 5), pierced several times
• 1/2 tablespoon olive oil
• 1 to 1 1/2 pounds flank steak
• kosher salt and black pepper
• 1/2 cup sour cream
• 3 1/2 teaspoons fresh lemon juice
• 1 teaspoon cider vinegar (optional)
• 2 tablespoons finely chopped fresh chives, plus more for serving
• 1 5-ounce bag arugula

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