Heat an oven grill (broiler). Toast the bread lightly, just to dry it on both sides and remove from the oven.
Peel the pear and halve it vertically. Core and divide each half into six or eight thin slices.
Put the sugar and butter in a saucepan on a medium heat, and add the pear slices. Sauté until the sugar begins to caramelise lightly and the pears are soft, but still in their