How to slow cook tri tip in the oven for optimal tenderness and flavor?

To slow cook tri tip in the oven for optimal tenderness and flavor, first season the meat with your preferred spices and let it marinate for at least an hour. Preheat the oven to 250F (120C) and place the tri tip in a roasting pan. Cook it for about 3-4 hours, or until the internal temperature reaches 135-140F (57-60C) for medium-rare. Let it rest for 10-15 minutes before slicing against the grain. Enjoy your tender and flavorful tri tip!