Unroll one 11-ounce tube refrigerated French bread dough and sprinkle with 1/4 teaspoon pepper. Cover with 8 slices prosciutto. Roll into a log and twist, pulling and shaping it into an 8-inch ring. Pinch the ends together. Place on a parchment-lined baking sheet, brush with olive oil and bake at 375 degrees F until golden, 20 minutes. Brush with more oil; bake 5 more minutes. Remove from the oven and brush with more oil.