
A popular cut in the West, tri-tip is also called "triangle roast." It comes from the bottom sirloin.
Recipe information
Total Time
50 minutes
Yield
Makes 6 servings
Ingredients
Preparation
Step 1
Prepare barbecue (medium-high heat). Whisk oil, vinegar, and 3/4 teaspoon mustard in large bowl. Season dressing with salt and pepper. Transfer 2 tablespoons dressing to small bowl; whisk in sugar and 1 teaspoon mustard. Sprinkle beef all over with salt and pepper, then top with mixture from small bowl.
Step 2
Grill beef until thermometer inserted into thickest part registers 120°F to 125°F for rare, turning occasionally, about 30 minutes. Place on cutting board; let rest 10 minutes. Cut very thinly across grain.
Step 3
Meanwhile, add tomatoes, watercress, and onion to dressing in large bowl. Marinate while beef grills, tossing occasionally. Grill bread, cut side down, until just crusty, about 3 minutes; place on plates, grilled side up.
Step 4
Arrange beef slices over bread. Using tongs and draining slightly, top with salad.