Mix all the ingredients for the marinade and rub all over the steak. Put aside to marinate for 15 minutes.
Add cooking oil and butter to a cast iron pan or oven proof pan and heat to medium high. Sear tri tip fat side down for 3 minutes and then flip over and cook for another 3 minutes.
Pour marinade sauce over tri tip and place in oven.
Roast for 12 minutes per pound. This should cook the beef to a medium to medium rare. Best to use a meat thermometer for your desired temperature.
While your meat is roasting, mix all ingredients together for the dipping sauce.
Let it sit so all the flavors can infuse together.