Buy an unsliced brown or white loaf. Using a long sharp knife, cut off all the crusts except the bottom, then cut bread in thin slices lengthways. If you like, put the trimmed but unsliced loaf in the freezer for 30 minutes and you will find it easier to cut the bread in slices. Run a rolling pin over each slice to prevent the bread from cracking when it is rolled. Butter each slice right to the very edge, then spread with a smooth filling so bread rolls easily. Starting from one short end, roll up each slice. Wrap rolls individually in kitchen foil, twisting the ends like a cracker, and refrigerate for several hours to set butter and filling. Cut chilled rolls in ½ inch (1cm) slices. Choose from among these fillings: