Take the puff pastry out of the fridge about 10 minutes before processing. Peel and halve the pears, remove the core. Sprinkle pear halves all around with sugar. Spread the cut surface downwards on a baking tray lined with baking paper.
Roll out the puff pastry and cut out 10 oval pieces in pear shape. Place over the halved pear halves and press on. Cut 10 leaves from the puff pastry remnants and press them onto the stem ends of the pears.
Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: see manufacturer) for approx. 15 minutes. Remove from the oven and let cool off. Arrange the cooled, still warm pears each with 1 scoop of ice cream and vanilla sauce.