Heat vegetable oil in a large skillet. Brown brisket on all sides, about 8-10 minutes. Add garlic half way through. Transfer meat to slow cooker. Pour beer in skillet, scraping up brown bits. Simmer for one minute. Add to slow cooker. Nestle celery around beef.
In a medium bowl, add remaining ingredients and whisk. Pour over beef. Cook on low for 8 hours. Remove from cooker and allow to sit about 10 minutes before cutting.
Garlic Parmesan Mash ingredients:
5-6 medium russet potatoes, peeled and cut into chunks
1/2 C. milk
2 TBSP butter or margarine
1 tsp garlic salt
1/2 C. shredded parmesan cheese
In a large pot, cover potatoes with water and bring to a boil. Boil approximately 20 minutes. Drain water. Add remaining ingredients and whip with hand mixer.
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