Root Vegetable Gratin
15 ingredients
5 steps
Ingredients
- 1/2 pound medium red potatoes, scrubbed but not peeled
- 1/2 pound medium red beets, peeled
- 6 ounces yellow beets, peeled
- 7 ounces fennel bulb, green stalks trimmed (save one big feathery frond for garnish)
- 1/4 pound round red radishes
- 2 tablespoons unsalted butter
- 2 tablespoons minced fresh rosemary
- 2 tablespoons minced fresh thyme, divided
- 1 shallot, finely diced
- 3 garlic cloves, grated (use a Microplane)
- 1 1/2 cups whipping cream
- 1 tablespoon flour
- About 2 tsp. each fine salt and freshly ground pepper
- 3/4 cup finely shredded Gruyere cheese
- 1/4 cup finely shredded parmesan cheese
Directions
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1Using a handheld slicer, slice potatoes, beets, fennel, and radishes into 1/8-in.-thick slices. Preheat oven to 325°.
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2Put butter, shallots, and garlic in a small saucepan and cook over medium-low heat until aromatic, about 1 minute. In a small bowl, whisk 2 tbsp. flour with 1/4 cup cream until smooth. Whisk in remaining cream, then pour into saucepan along with 1 tbsp. thyme, the rosemary, salt, and pepper; let simmer until shallots are translucent, about 5 minutes.
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3Butter a 1- to 1 1/2-qt. ceramic or cast-iron gratin dish or shallow baking dish. Arrange half of potatoes, beets, radishes, and fennel slices tightly to cover bottom of dish, overlapping them like dominos and alternating vegetable types, in an oval around edges and a row up center. (You may have to tuck fennel pieces in since slices may not hold together.) Season lightly with salt and pepper. Pour half of cream mixture over slices, stirring as you pour so shallots and garlic are evenly distributed, and top with half of Gruyere. Arrange remaining sliced vegetables the same way, then top with remaining cream mixture and Gruyere. Sprinkle parmesan on top.
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4Cover gratin with oiled foil and bake until vegetables are tender when pierced with a fork, 1 to 1 1/2 hours. Remove the foil and broil until golden and bubbly, about 5 minutes.
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5Top with remaining 1 tbsp. thyme. Let sit 10 minutes before serving.
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