Place cut carrots, celery, onion and potatoes in the bottom of a large crock pot.
Mix tomato paste, garlic, paprika and Worcestershire sauce together in a small prep bowl and set aside.
Trim meat and cut into 1" cubes.
Place flour, salt and pepper into a large zipper lock bag. Add meat, seal bag and shake to coat.
In a large skillet heat 1 Tablespoon vegetable oil until hot. Add half of the meat and brown quickly on all sides. Be careful to separate the pieces. Transfer meat to the crock pot and brown the remaining pieces. Spoon the tomato paste mixture over the last batch of beef and stir well to coat. Cook about 1 minute longer then tranfer contents of skillet to the crock pot.
Add the bay leaves and pour the beer over everything. Cover and cook on low for 8-10 hours. (Note, this was fully cooked in my crock after 8 hours.).