Using fork, pierce the meat all over. In a mixing bowl, whisk the remaining ingredients together until the sugar dissolves. Pour the brine over the meat, cover, and refrigerate for 10 days. Remove the meat and rinse thoroughly. Place the meat in a stock pot and cover with water. Bring the liquid up to a boil and reduce the heat. Simmer for 1 hour. Pour off the water, cover with cold water and repeat cooking process until the beef is very tender. Remove from water. Cool the meat and slice paper thin. To make a reuben: On both slices of rye sourdough bread, spread Russian dressing. Layer the meat, cheese and sauerkraut between the bread. Spread butter on both sides of bread and place on a hot grill. Grill for 2 minutes on each side. Remove from the heat and slice.