Preheat oven to 350oF (180oC).Line a 20x10.5x6 cm (8x4x2.5 inch) loaf pan with parchment paper. To a bowl, add sugar and water. Whisk until sugar is completely dissolved.
Then add oil and mix well.
Sift in flour, cocoa powder, baking powder, baking soda and salt.
Mix until dry flour is no longer visible. DO NOT OVER MIX (mix until dry and wet ingredients are just combined).
Pour batter into prepared loaf pan. Set aside.
Peel pear and dust with flour.
Place pears in batter.
Bake in preheated oven to 350oF (180oC), rack middle position, 45-50 minutes, or until toothpick inserted in the middle of cake comes out clean.
Let cake cool down in pan for 10 minutes. Then transfer cake to wire rack to cool down completely.