Winter Gratin of Potatoes, Leeks, Feta and Olives
Serves 4 to 6.
Note: Serve as a main dish or accompaniment to roast lamb or chicken; it can be assembled ahead. Vary the cheese and swap out the olives for capers or sun-dried tomatoes. Be sure to slice the potatoes thin so they'll bake evenly. From Beth Dooley.
• 2 lb. boiling or low-starch potatoes
• 1 large leek
• 2 tbsp. unsalted butter, plus a little extra, divided
• 1/4 c. sliced green olives
• 1 c. crumbled feta
• Salt and freshly ground black pepper