Preheat the oven to 300°F. Rub roast lightly with olive oil then sprinkle on all sides with the zesty Italian salad dressing mix.
Heat a few drizzles of olive oil in a dutch oven or similar. Brown the roast for 2-3 minutes on each side.
Drizzle the roast with Worcestershire sauce, arrange the sliced pepper and onion over the roast.
Season the vegetables lightly with garlic salt and black pepper, Sprinkle with dry Italian seasoning.
Pour the diced tomatoes over the vegetables then drizzle with tomato sauce.
Cover and braise in the oven for 3 hours.
Uncover and test for doneness the roast should be fork tender. Remove the roast to a platter and cover to keep warm.
Put the dutch oven onto the stovetop over high heat. Skim the fat from the top.
Bring to a boil and thicken with tomato paste.
Slice the roast beef and return to the thickened sauce. Keep warm until serving.
Slow Cooker Instructions:
Follow the same instructions through step #3.
After browning on the stovetop place the roast into a 6 quart oval slow cooker sprayed with cooking spray.
Drizzle the roast with Worcestershire sauce, arrange the sliced pepper and onion over the roast.
Season the vegetables lightly with garlic salt and black pepper, Sprinkle with dry Italian seasoning.
Pour the diced tomatoes over the vegetables then drizzle with tomato sauce.
Slow cook on low for 8-10 hours or until fork tender.
Pour the drippings from the slow cooker into a medium saucepan. Skim the fat. Bring to a simmer and thicken using tomato paste as directed.
Slice and return the roast to the sauce or ladle on top. Keep warm until serving.