Preheat oven to 350F and line a sheet pan with foil. Drizzle the foil with olive oil.
Place the pork tenderloin in the center of the pan and surround them with the potatoes, carrots and onions. Season everything generously with salt and pepper.
In a bowl, mix together the marinade ingredients. Pour the marinade over the pork tenderloin and the vegetables. Toss the vegetables lightly to ensure they are coated in the marinade.
Roast for 45-50 minutes or until the pork tenderloin is cooked through. Remove from the oven* and let it sit for 5 minutes before slicing and serving. Spoon leftover pan sauce over the pork tenderloin before serving.
