Cook rump roast for 8 hours in a crockpot with a small amount of water covering the bottom at medium temperature. Beef should be fork-tender and falling apart easily. Remove and shred beef with a fork and knife. Melt butter in a large pot. Add onion and cook until tender. Stir in ketchup, salt, pickle juice, brown sugar, mustard and Worcestershire sauce. Simmer together for 5 minutes then add pulled beef and simmer until hot. Serve on your favorite rolls. This also freezes well
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