Herb-Roasted Beef Tri-Tip with Root Vegetables
A straightforward oven-roasted beef tri-tip crowned with rosemary and garlic, surrounded by potatoes, peppers, and onions that caramelize during cooking. The meat stays juicy through high-heat roasting and a crucial rest period, while vegetables develop deep color and tender interiors. Ideal for weeknight dinners or casual entertaining when you want impressive results without fuss. This version includes both conventional oven and air fryer methods, offering flexibility based on your equipment and time.
Ingredients
- 1 ½ to 2 pounds, beef tri-tip roast
- 1 tablespoon olive oil
- 12 small red-skinned potatoes, halved
- 2 medium bell peppers, red, yellow, or green, cut into eighths
- 2 medium sweet onions, cut into 1-inch wedgesyellow or white onions1:1flavor difference; less sweetness
high
- 2 teaspoons garlic, minced
- 1 teaspoon rosemary, dried leaves
- ½ teaspoon salt
- ¼ teaspoon black pepper
Instructions
- 1
Heat oven to 425F.
- 2
Mix garlic, rosemary, salt, and pepper. Press half the mixture onto beef tri-tip roast.
- 3
Toss potatoes, peppers, and onions with olive oil and remaining seasoning.
- 4
Place roast on rack in shallow roasting pan. Arrange vegetables around roast. Do not add water or cover.
- 5
Roast at 425F for 30 to 40 minutes until internal temperature reaches 135F for medium rare, or 40 to 50 minutes for 150F medium.
- 6
Remove roast to cutting board and tent with foil. Rest 20 to 25 minutes.
- 7
Meanwhile, increase oven to 475F. Remove peppers from pan.
- 8
Continue roasting potatoes and onions 10 minutes until tender and lightly browned.
- 9
Carve roast across the grain. Serve with vegetables.
Tips
Rest the roast covered loosely with foil after cooking. This allows carryover cooking to complete the cooking process and redistribution of juices back into the meat, resulting in better texture and moisture.
Carve the roast across the grain by identifying the muscle fibers and cutting perpendicular to them. This shortens the fibers and makes each bite more tender.
For even vegetable cooking, cut potatoes and onions into similar-sized pieces so they brown and soften at the same rate.
Good to Know
Refrigerate leftovers in airtight container up to 4 days. Reheat gently at 325F for 15 to 20 minutes until warmed through. Do not overheat or meat will dry out.
Prepare vegetables and seasoning mix up to 8 hours ahead. Store seasoning in airtight container; keep cut vegetables in sealed bag with minimal air. Pat dry before roasting to promote browning.
Serve warm with pan drippings spooned over vegetables and sliced roast. Pairs well with crusty bread, roasted garlic aioli, or a fresh green salad with vinaigrette.
Common Mistakes
Skip the rest period to avoid dry, tough meat; carryover cooking is essential to final doneness.
Do not skip carving across the grain to avoid stringy, chewy texture.
Do not overcrowd the pan to avoid steaming vegetables; arrange in single layer around roast.
Do not add water or cover pan to avoid braising instead of roasting.
Substitutions
medium
high
FAQ
Can I make this in an air fryer?
Yes. Heat air fryer to 350F. Place roast in basket and cook 30 minutes. Flip roast, add potatoes, and continue cooking 30 to 40 minutes until internal temperature reaches 135F for medium rare or 150F for medium. Rest 20 to 25 minutes. Add peppers and onions with potatoes during final 10 minutes.
What if my roast is smaller or larger than stated?
Adjust cooking time: smaller roasts (1 to 1.25 pounds) may finish 5 to 10 minutes earlier; larger ones (2 to 2.5 pounds) may need 10 to 15 minutes longer. Always rely on internal temperature rather than time alone.
How long can I keep leftovers and can I freeze them?
Refrigerate up to 4 days. Freezing is not recommended as the meat texture deteriorates significantly upon thaw. Best consumed fresh or within 2 days for quality.