Key lime pie is my very favorite dessert, when it is done properly. Real key lime pie, the kind you might find in a Florida steakhouse, only has four ingredients: sweetened condensed milk, key lime juice, key lime zest and egg yolks. It is pale yellow, almost white, in color and has the consistency of thick custard. The crust is important too. For a long time, I tried different combinations with graham crackers, but the results never had the proper balance of butter, sugar and salt. Finally, I tried a crust using English digestive crackers, and I really like the results. I have added some grapefruit zest to this tart, and I think it adds a lot of extra citrus flavor.

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