Natural white leaven refers to sourdough starter made entirely from white flour, either bread or all-purpose flour. The bread made with preferments (either prepared with commercial yeast or wild yeasts and bacteria) yields a more complex flavour and taste. Enjoy this rustic apple oat bread with a bowl of steaming hot soup or a salad for a simple yet satisfying lunch.
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- Put the rolled oats into a small bowl and pour over the boiling water. Leave aside for 5 minutes while you prepare the other ingredients. Add the grated apple to the water, leaven, and yeast. Stir the mixture well until the yeast is dissolved, then stir the soaked oats into this. In another bowl weigh the flour with the salt. Pour the wet ingredients into the flour and stir the mixture with your hands until it is evenly combined and you have a soft, sticky dough. Scrape any dough from Your fingers into the bowl, cover and leave for 10 minutes.
- Rub 1 teaspoon olive oil on the work-surface and knead the dough on the oiled surface for 10 seconds, ending with the dough in a smooth, round ball. Clean and dry the howl, then rub lightly with a teaspoon of olive oil. Return the dough to the bowl, cover, and leave for a further 10 minutes. Remove the dough and knead once more on the oiled surface, returning the shape of the dough to a smooth, round ball. Put it back in the bowl, cover and leave for 1 hour at room temperature.
- Lightly flour the work-surface and shape the dough into a baton or a round. Rub a tea-towel with a handful of flour (or use a linen-lined proving basket) and place the dough inside seam-side-up. Wrap the dough snugly in the cloth, and leave to rise for 1 1/2 hours, or until almost doubled in height.
- Preheat the oven to 210C/410F. Upturn the loaf on to a flour dusted tray, then brush the surface of the loaf with the egg wash and dust with rolled oats. Bake the loaf in the centre of the oven for 30 minutes, then lower the heat to 190C/375F and bake for a further 15-20 minutes, until the loaf is a good brown, feels light in weight, and sounds hollow when tapped on the base. Leave to cool on a wire rack.
