INGREDIENTS
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2 pounds celery root (celeriac), peeled, cut into 3/4â cubes
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Kosher salt
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1 1/2 pounds kohlrabi, peeled, cut into 1/2â cubes
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1 pound russet potatoes, peeled, cut into 1â cubes
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1 Granny Smith apple (1/2 lb.), peeled, cored, cut into 1â cubes
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2 tablespoons (1/4 stick) unsalted butter
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Freshly ground black pepper
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Fresh chervil sprigs