Pork Saltimbocca

Ingredients

• 1 (1 1/4 pound) pork tenderloin
• salt and freshly ground black pepper to taste
• 12 fresh sage leaves, or as needed
• 4 large, thin slices prosciutto
• 2 teaspoons all purpose flour for dusting
• 2 tablespoons olive oil
• 2/3 cup dry white wine
• Stock:
• 1 tablespoon butter
• chopped pork trimmings (optional)
• 1 cup homemade or low-sodium chicken broth
• 1/2 cup water, or as needed
• 1 teaspoon unflavored gelatin