Combine spice bag, onion, and next 7 ingredients in a shallow dish or large heavy-duty zip-top plastic bag; add roast. Cover or seal, and chill 8 hours, turning occasionally.
Remove roast from marinade, reserving marinade.
Brown roast in hot oil in a Dutch oven. Remove roast, reserving drippings in pan. Whisk flour and sugar into reserved drippings, and cook over medium-high heat, whisking constantly, 2 minutes or until browned. Gradually stir in reserved marinade. Return roast to pan; bring mixture to a boil. Cover, reduce heat, and simmer 2 1/2 hours.
Discard spice bag and bay leaves. Remove roast, reserving drippings in pan; slice and keep warm.
Stir gingersnaps into reserved drippings in Dutch oven; simmer, stirring constantly, 2 minutes. Pour mixture through a colander into a bowl. Press vegetables through colander with back of a spoon. Serve gravy with roast.
What a delight on a snowy winter's night! I made this recipe in the slow cooker (5 hours on High for a four pound roast), and served it with cheese & carmelized onion spaetzle as well as red cabbage. It felt like I was channeling my inner German grandma.
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