Trim: Use a sharp knife to remove the silver skin from the pork tenderloin.
Make Marinade: In a large bowl, combine the banana ketchup, soy sauce, soda, brown sugar, vinegar, juice from the orange and limes, garlic, ginger and pepper.
Marinate: Add the pork tenderloins to the marinade and refrigerate. You can marinate in as little as 30 minutes, but four hours is best.
Heat Grill: Heat your grill with two-zone cooking with one side set to medium heat.
Grill: Remove the pork from the marinade. Save the marinade. Grill the pork over direct heat for about 15 minutes, flipping occasionally.
Heat Marinade: While the pork is grilling, place the marinade in a pot on the grill or stovetop and simmer for 5 minutes.
Indirect Heat: Once charred on all sides, move the pork to the indirect heat zone and continue cooking until the internal temperature reaches 145F degrees. This should take 5-10 minutes.
Rest: Once the pork reaches 145F, remove it from the grill and let it rest for about 10 minutes.
Slice: Slice the rested pork into medallions and drizzle with sauce. Garnish with sliced green onions.
Notes
Pork tenderloins usually come two to a package, so you'll only need one package for this recipe.