Hi Annie, most sandwich bread recipes don't call for a preferment because they derive their flavor from the enriched ingredients generally called for in this type of recipe. However, if you'd like to add a preferment, this recipe for Pain de Mie with a Starter is a great place to begin your quest. To reduce this recipe and bake it in a 9 X 5 pan, I would multiply the weight of each ingredient by .66. 

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