Due to time constraints, you decide to buy a pie shell from the store. Recipes for pie crusts in the middle ages are few and far between, because it was assumed to be one of those things that any cook already knew. Most sources agree that crusts were usually a simple mix of flour and water, sometimes with fat or butter added to make them lighter. As it turns out, store-bought pie shells use very similar ingredients (with the addition of some colouring and preserving agents), so this is a reasonable substitution.
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