Heat oil in a large skillet with deep sides over medium heat.
Add onion, and saute until transluecent.
Add garlic, saute one more minute until fragrant.
Add beef, salt and pepper. Brown beef until no longer pink, drain any fat.
Add beef mix to a crock pot.
Combine together beef bouillon, beef broth, Worcestershire sauce and apple cider vinegar.
Pour over beef and stir to combine.
Cook on low for 3-4 hours, stirring occasionally.
Serve on sturdy buns.
