Step 1 - Gather Ingredients
1 beef tri-tip roast (1 1/2 to 2 pounds)
1/2 cup prepared Italian dressing
6 cups assorted vegetables
(onion wedges, 3/4-inch zucchini or yellow squash slices, 1-inch red bell pepper pieces, medium mushrooms)
Seasoning:
1 tablespoon packed brown sugar
2 teaspoons cracked black pepper
2 cloves garlic, minced
1/2 teaspoon salt
1/2 teaspoon dried thyme