How long and what temp for a 1.8lb tri tip?

For a 1.8 lb tri-tip, you can roast it in the oven at 425°F (220°C) for about 25-30 minutes per pound, aiming for an internal temperature of 135°F (57°C) for medium-rare. Alternatively, you can grill it over medium-high heat, cooking for approximately 30-40 minutes total, flipping occasionally. Let it rest for 10-15 minutes after cooking before slicing for the best results.