Easy Beef Sandwiches * 1 Large Onion, Sliced * 1 Rump Roast (3 to 5 Lbs.) * 1 Cup water * 1 Envelope au Jus Mix (1 Oz) Place Onion, Slices in Bottom of Slow Cooker; Top With Roast. Combine WaterAnd au Jus Mix in Small Bowl; Pour Over Roast. Cover And Cook on Low 7 to 9Hours. Tip: Before Serving, Shred The Meat in The Slow Cooker. Serve on FrenchBread With The Liquid From The Slow Cooker. Try Topped With provolone Cheese ForA Fantastic Sandwich. Smiles From The Lr