Spritz a saute pan with the olive oil spray.
Saute the veggies until softened.
Place the veggies in the crockpot.
Spritz the saute pan with the olive oil spray again, if necessary; add the roast and brown on all sides.
Remove the meat and place in the crockpot on top of the veggies.
Add the apple cider vinegar to the saute pan; stir the vinegar, gently scraping the pan to deglaze.
Add the beef broth and tomato puree to the saute pan; mix well.
When the broth mixture is warm and mixed well, pour over the meat in the crockpot.
Cook on low for 7-8 hours.