Pork Saltimbocca

1. Stage

Remove silvery membrane from surface of the tenderloin with a sharp knife. Reserve the trimmings. Trim off the small "head" pieces of the tenderloin where there is a natural separation; this is optional. Reserve.

2. Stage

Cut tenderloin in half crosswise to make 2 equal portions. Cut each half lengthwise in half to make 4 pieces. Transfer to a bowl; refrigerate while you start the sauce.

3. Stage

Chop the reserved trimmings very fine. Melt butter in a pot over medium-high heat until caramelized and nicely browned, 4 or 5 minutes. Stir in broth and gelatin. Stir in water. Cook and stir over medium or medium-low heat at a low simmer until liquid is reduced by half, about 1 1/2 hours. Add more water if it reduces too quickly.

4. Stage

Place pork sections between to pieces of plastic wrap. Pound to a thickness of about 1/4 to 1/8 inch thick. Remove top sheet of plastic wrap. Turn each piece over. Sprinkle generously with salt and pepper. Dust very lightly with about 2 teaspoons flour. Flip back over; sprinkle with black pepper only. Press 3 sage leaves onto surface of each piece of pork. Cover completely with prosciutto, cutting or tearing strips to fit. A bit of overlap is okay.

5. Stage

Place sheet of plastic wrap back over the pork and pound very lightly to make sure the prosciutto sticks to the pork. Transfer to a plate; cover with plastic wrap. Refrigerate until chilled, at least 30 minutes.

6. Stage

Strain pork broth into a bowl.

7. Stage

Place skillet over high heat; add olive oil. When olive oil is hot and shimmering, place pork pieces in the oil prosciutto side down. Cook about 3 minutes. Carefully turn pieces and cook another minute. Remove skillet from heat. Transfer pork to warm serving plates.

8. Stage

Blot excess oil from skillet with paper towels. Add wine and pork broth. Cook over high heat until mixture thickens and reduces by about half, 4 to 5 minutes.

9. Stage

Spoon hot sauce over pork sections. Chef John