Spread the rolls with whipped cream cheese instead of the mustard-butter blend, and substitute a spoonful of chunky cranberry relish for the tomato slices.
Even preschoolers can help "build" these sandwiches. If you have more than one helper, set up a sandwich assembly line. The first child in line can spread the butter-mustard mixture on the rolls, then pass each plate to the second, who adds the lettuce, pastrami, cheese and so on.
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