Slow Cooker Sauerbraten

http://www.myrecipes.com/recipe/sauerbraten-50400000124400/
Serve this over spaetzle :)

• 1 cup water
• 2 tablespoons sugar
• 3/4 cup white vinegar
• 1 1/2 teaspoons salt
• 6 black peppercorns
• 5 whole cloves
• 3 bay leaves $
• 1 lemon, sliced $
• 1 (3-pound) rump roast, trimmed
• 1 1/2 cups sliced onion (1 large)
• 1 head of cabbage, shredded
• 15 gingersnaps, crumbled
• Chopped fresh parsley (optional)

Preparation

1. 1. Place first 8 ingredients in a large heavy-duty zip-top plastic bag; seal bag. Turn bag to blend marinade. Place roast  in bag; seal bag, turning to coat. Marinate in refrigerator 24 hours, turning bag occasionally.
2. 2. Remove roast from marinade, reserving marinade. Place roast, onion, and cabbage in a 5-quart electric slow cooker. Strain reserved marinade through a sieve into a bowl, reserving 1 1/2 cups; discard remaining liquid and solids. Pour 1 1/2 cups strained marinade over roast. Cover and cook on LOW for 5 hours or until roast is tender.
3. 3. Remove roast from slow cooker; cover and keep warm. Add gingersnap crumbs to liquid in slow cooker. Cover and cook on LOW for 8 minutes or until sauce thickens; stir with a whisk until smooth. Serve sauce with roast. Garnish with parsley, if desired.