How to Make It
Preheat oven to 450°F. Combine olive oil, kosher salt, black pepper, and halved fingerling potatoes on a baking sheet. Bake at 450°F for 20 minutes. Cook diced pancetta in a skillet over medium 5 minutes. Add sliced red onion; cook 2 minutes. Stir in red wine vinegar, olive oil, and grainy Dijon mustard. Add pancetta mixture, chopped chives, and chopped tarragon to potatoes.