Pour the olive oil on the bottom of the slow cooker. Salt and pepper the beef and add it to the slow cooker. Placed sliced onion on top of the beef, and sprinkle on the dried herbs evenly. Add the garlic cloves. Pour in the vinegar and top with the tomatoes.Cook on high for 4 hours or low 6 to 8 hours. Serve over whole wheat angel hair pasta or long grain brown rice.