In a food processor, combine peanuts, sesame seeds and salt. Transfer to wide plate. In a small bowl, combine mustard, sesame oil and soy sauce and blend well.
Add peanut dipping sauce ingredients to blender, and process until smooth.
Evenly coat meat with mustard mixture. Roll coated meat into peanut and sesame seed mixture, pressing down so that coating sticks to tenderloin.
Heat a thin layer of peanut oil over medium-high heat in a large skillet. Carefully add coated tenderloin, and lightly brown on one side. Flip over and brown the other side. Drizzle lime juice over meat, remove meat from pan, and let rest for a few minutes before slicing into 1/2-inch thick medallions with a sharp, thin-bladed knife. Arrange on a plate with dipping sauce on the side.