1. In a large mixing bowl, combine the Barley flour, Wheat flour, Granulated sugar, Salt, and Instant dry yeast. Whisk them together until well combined.
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2. Gradually add the Warm water to the dry ingredients, mixing with a spatula or your hands until a shaggy dough forms.
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3. Add the Vegetable oil to the dough. Transfer the dough to a lightly floured surface and knead for 8-10 minutes until it becomes smooth and elastic. It should pass the 'windowpane test'.