In a large bowl, combine the bread flour, all-purpose flour, sugar, yeast and salt. Whisk together until evenly combined.
Add the warm water and oil, stirring until a soft dough forms. Knead the dough for about 10 minutes, until it is smooth and elastic.
Transfer the dough to a lightly greased bowl and cover with a clean kitchen towel. Let the dough rise in a warm place until doubled in size, about 1 hour.
Punch down the dough and transfer it to a lightly floured work surface. Roll it out into a 9x13-inch rectangle.
Spread the water roux over the dough, leaving a 1/2-inch border. Roll up the dough into a log and place it in a lightly greased 9x5-inch loaf pan.
Cover the pan with a clean kitchen towel and let the dough rise until doubled in size, about 45 minutes.
Preheat the oven to 350°F. Bake the bread for 35-40 minutes, until golden brown.
Let the bread cool in the pan for 10 minutes before turning it out onto a wire rack to cool completely.
Interesting Facts
Water roux is a common ingredient in Asian breads, giving them a softer and fluffier texture.
The water roux also helps to preserve the bread for a longer period of time.
This bread is perfect for sandwiches, toast or just eating on its own.