Preheat the oven to 375 degrees F.
Combine the beets with 4 tablespoons of the oil and 2 tablespoons of water in a baking dish. Sprinkle with salt and pepper, cover with aluminum foil and roast until tender, about one hour. Once cool, peel and cut into thin wedges.
Meanwhile, make the vinaigrette: Combine the zest and juice of the orange, lemon and lime with the remaining 1/2 cup oil. Whisk to combine. Season with salt and pepper.
Trim the endive, cut each in half and remove the core. Slice each half into four pieces. Combine the endive, oranges, beets and 3 teaspoons of the vinaigrette in a bowl. (Reserve the remaining vinaigrette for another use.) Season with salt and pepper and mix to combine. Arrange the salad on a plate and top with the idiazabal.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.