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Merrill is a co-founder of food52.
added over 1 year agoYou could easily make them that morning. What I do to keep them fresh is make the sandwiches and cut them into fingers, arrange them on a plate or tray, cover them gently with a barely damp towel, and put them in the fridge. Then take them out 20 to 30 minutes before serving them so they come to room temperature.
Be sure to coat both top and bottom of the bread with butter. The butter creates a barrier for moisture of the cucumbers. Moisture will make the bread soggy before serving.
I would recommend no earlier than the morning of.
Thanks for the answers. Exactly the advice I needed.