Place biscuits and brown sugar into a blender or food processor. Process just until the biscuits are finely ground.
Add evaporated milk and process for about 1 minute.
Finally, add butter, lemon juice and cinnamon and process again for about 30 seconds.
Store the spread in a clean, airtight jar in the refrigerator for about a week. Use it as a fruit dip, or for drizzling on ice cream, pancakes, or anything you like.