Preheat oven to 160°C (320°F). Place the sugar on a plate and press the pear slices into it. Place the slices on baking trays lined with baking paper and bake for 15 minutes, turn and cook for a further 15 minutes. Cool on wire racks until crisp. Pear wafers can be served with sorbet, ice-cream or panna cotta, or on a cheese plate with a strong blue cheese or as a petit four with coffee.