A tri-tip dinner is a cut of beef that is typically found in the western United States.  It comes from the bottom sirloin subprimal cut and is sometimes referred to as a triangle roast or triangle steak. Tri-tip is usually cut into triangular-shaped steaks, which are then grilled, smoked, or roasted.  This type of dinner is often served with grilled vegetables, potatoes, or other side dishes.  The unique flavor of a tri-tip dinner comes from the combination of fat marbling throughout the meat and its robust seasoning, which can include anything from garlic powder, onion powder, oregano, and cumin.  This type of meal is also known for being an affordable yet delicious option when feeding a crowd.