Best Pot Roast Ever

I made this tonight...it's a combination of a few different recipes I've culled from different sites...seriously good.

Ingredients:
- Beef chuck roast, ~3lb
- 1 cup tomato juice
- 1/2 cup balsamic vinegar
- 1 large onion, chopped
- 1/2 cup raisins
- mustard, any variety

Rub:
- 1/2 cup brown sugar
- 3 tbsp paprika
- 1 tbsp onion powder
- 1 tbsp garlic powder
- 1 tbsp ground cumin
- 1 tbsp dried oregano
- 1 tbsp cayenne pepper
- 1 tbsp black pepper
- 1 tsp salt

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- rub roast with mustard to cover; combine rub ingredients and...rub into the roast
- place into slow cooker on high heat, or into 225 degree oven in small pan. let cook untouched for 3 hours.
- after this time, add chopped onion, raisins, tomato juice and vinegar. cook for an additional 2 hours or until fork tender (internal temp 190).
- prepare to get laid after making this for someone. This could be awkward if it's for a family gathering.