Combine the sugar and cinnamon in a bowl. Set aside. Place the flour, eggs, milk, vanilla and extra sugar in a bowl and whisk until smooth. Heat the oil in a large, deep saucepan over medium heat until hot. Dust the pear slices with plain flour and dip in the batter. Deep-fry, in batches, for 2–3 minutes or until golden and crisp. Toss the hot pear fritters in the cinnamon sugar to coat.