Appears in Cook's Illustrated November/December 2019, America's Test Kitchen TV
For a new holiday side, we gussy up greens with a touch of cream and a crisp topping.
For a creamy, rich green gratin with a crisp, flavorful bread-crumb topping, we started with a mixture of kale and Swiss chard. Sturdy kale kept the gratin fluffy and tall; Swiss chard collapsed when cooked, but its plentiful tender stems a...