Slice baguette lengthwise. One the top half, spread a thick even layer of blackberry jam. On the bottom half, spread an even layer of stone ground mustard. Evenly distribute ham across mustard, and then top with cheese and lettuce. Replace top half of baguette. Slice and serve.
Recipe by Wright Family Table at https://www.wrightfamilytable.com/black-forest-ham-manchego-sandwiches/