Pork Saltimbocca

Remove silvery membrane from tenderloin with a sharp knife; reserve trimmings. Cut the small "head" pieces of tenderloin where there is a natural separation; reserve. (This is optional.) Chop reserved trimmings very fine; set aside.

Cut tenderloin in half crosswise to make 2 equal portions. Cut each half in half lengthwise to make 4 pieces. Transfer to a bowl; refrigerate until needed.

Melt butter in a pot over medium-high heat. Add reserved trimmings; cook and stir until caramelized and nicely browned, 4 to 5 minutes. Stir in broth and gelatin, then stir in water; simmer and stir over medium or medium-low heat until liquid is reduced by half, about 1 ½ hours. Add more water if it reduces too quickly.