Eggs In a Hole

Using a sharp knife, peel the grapefruit, removing all the white membrane. Carefully cut down along the side of one section to the center of the grapefruit, then turn the knife and life the section out. Remove the remaining sections from the membranes, separating them. Set aside. In a wide, shallow dish, whisk together 2 of the eggs, the milk, sugar, salt, and cinnamon. Using a 2 1/2-inch round biscuit cutter, cut a hole in the center of each of 2 slices of bread. Put all 4 slices of bread in the egg mixture and let them soak for 1 minute on each side. In a saute pan or skillet large enough to fit the bread slices in one layer, melt the butter over medium-high heat. When the foam subsides, carefully transfer the bread slices to the pan. Crack 1 egg into each hole in the bread slices. Cook until the bread is well browned on the bottom, about 3 minutes. Gently turn the slices over and cook until the second side is well browned, about 2 minutes. Place 1 of the hole-less bread slices on each of the serving plates. Lay 2 slices of the prosciutto over each and top with the bread slices with egg. Drizzle with maple syrup and serve immediately, with the grapefruit sections alongside.