Lamb Skewers with Grainy Mustard Dipping Sauce

• MAKE-AHEAD

Ingredients

1. 1/4 cup vegetable oil
2. 1/4 cup finely chopped onion
3. 2 tablespoons red wine
4. 2 tablespoons rosemary leaves
5. 2 garlic cloves, smashed
6. 1 tablespoon Dijon mustard
7. 3/4 pound boneless trimmed lamb loin, halved lengthwise
8. 1/4 cup whole-grain mustard
9. 3 tablespoons crème fraîche or heavy cream
10. 1 1/2 teaspoons honey
11. Cayenne pepper
12. Freshly ground black pepper
13. 1 tablespoon extra-virgin olive oil
14. Salt

1. In a blender or mini-processor, combine the vegetable oil, onion, wine, rosemary, garlic and Dijon mustard and blend until smooth. Transfer the marinade to a resealable plastic bag, add the lamb and refrigerate overnight.
2. In a small bowl, combine the whole-grain mustard, crème fraîche, honey and a pinch each of cayenne and black pepper; whisk until smooth.
3. Remove the lamb from the bag and scrape off the marinade. Heat the olive oil in a skillet. Season the lamb with salt and black pepper, add it to the skillet and cook over high heat until browned, about 3 minutes on each side for medium rare. Transfer the lamb to a cutting board, cover with foil and let stand for 10 minutes.
4. Thinly slice the lamb, fold the pieces and spear them on wooden picks. Transfer to a platter and serve immediately with the mustard dipping sauce.