Thaw and drain the cranberries ahead of time. Set the butter out to soften a couple hours ahead of time.

Puree the cranberries with the butter, honey, and mustard in a food processor or blender on high speed for about one minute, then spread on one side of each slice of bread. (Note: Will be trying with a fine chop with a knife and mixing everything together with a fork on first attempt)

Assemble the sandwiches and enjoy.