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Place 2 cups (1lb 2oz / 500g) of flour on a pastry board or in a deep bowl. Make a well in the center of the flour; add 1tsp / 3g baking soda and 7oz / 200ml water. Gradually mix with hands or a wooden spoon until well blended. Gather into a ball and knead on a floured surface until smooth, about 10 minutes. Wrap the dough with plastic wrap and rest for 40 - 60 minutes.