Prepare a wood or charcoal fire in a grill, or set a gas grill on high (you can also use a broiler). Wipe the grill rack clean and rub with oil.
Slice the bread a generous 1/4 inch thick (cut the slices in half if they're large). When the coals are hot but no longer flaming, put the bread on the rack and grill until lightly browned, 1 to 2 minutees. Turn and grill the other side. Transfer to a plate or basket and cover to keep warm. Arrange the garlic cloves, oranges, and prosciutto on a platter and serve with the olive oil.
Each diner should rub a piece of toast with a garlic clove, drizzle the toast with olive oil, and add a slice each of orange and prosciutto.
nutrition information (per serving):
per individual toast;
Photo: Martha Holmberg