If you're making the sandwiches in advance, chill the whole sandwiches on a tray lined with damp paper towels. Cover them with more damp towels, and wrap with plastic. When ready to serve, trim and cut the sandwiches, then garnish them. They will be easier to cut neatly when chilled. Pepperidge Farm Very Thin Sliced Bread in white or whole wheat works best for making tea sandwiches.