To start, remove the roast from the packaging and pat it dry. You do not need oil here the seasoning will stick just fine. Make a rub out of the seasonings and cover the roast heavy in the seasoning. There will be leftover rub, do not throw this away.
Now, this is optional but in a frying pan on medium high heat add a little oil and sear the outsides of the roast. Do not sear too long or at too high of heat to avoid burning the herbs and seasonings.
In the crockpot, place the roast right in the middle. Around the roast place carrots, sliced onion and the cut up potatoes.Now, place spoonfuls of tomato paste around the sides as well.
Next, fill the crockpot with beef broth slightly above the middle of the roast. Toss in bay leaves, balsamic vinegar, Worcestershire sauce and the leftover seasoning from earlier.
Cover the crockpot and cook on high for 6 hours or low for 10 hours. The final test is with two forks to pull apart the sirloin tip roast. That is when you are done, once the roast is tender.
When the roast is tender give the sauce a good mix in the crockpot before serving and remove the bay leaves. Serve with a classic side and be sure to drizzle the juices across when serving.