Mix together the butter, flours, oatmeal, sugar, egg and buttermilk to make a smooth batter, adding a little extra milk if the mixture looks very thick.
Brush a nonstick frying pan with a little oil and heat. Add a ladleful of batter to the pan and cook for 2 minutes on each side until golden. Remove the pancake from the pan and keep warm. Repeat with the remaining batter mixture to make 6 small pancakes in total.
Meanwhile, put the pears and cinnamon in a small saucepan with the water. Cover and cook gently for 2–3 minutes until just tender. Serve the pancakes with the cooked pears.