Butter a flame-proof casserole large enough to hold the endive in two layers. Sprinkle with the orange juice, some salt and 6 tablespoons of water. Cover and simmer for 10 minutes. Uncover and boil until the liquid is reduced to about 3 tablespoons. Cover the endives with cartouche sheet of buttered paper and a lid.
Bake in an oven preheated to