Rinse chuck roast under cold water and pat dry.
Set aside and let stand for 30 minutes.
Place all remaining ingredients in a food processor and pulse to combine.
Place chuck roast in a crock pot and liberally coat with asada marinade.
Add ¼ cup of filtered water to crock pot (this allows the meat to heat up evenly rather than scorching it in the crock pot) and cook for 5 hours on HIGH, turning meat over every hour.
Remove chuck from crock pot and let it rest about 20 minutes.
Slice meat across the grain and spoon over the juices from crock pot.
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