A recipe calls for Brown Ale, I didn't want to use beer, are there any substitutions? Here is the recipe - I didn't want to use Beer, any help?

3 lb chuck steak, cut into 2-inch chunks 
***1-1/4 pints Liefmans Goudenband*** 
2 Tbsp peanut oil 
1 oz butter 
1 oz brown sugar 
1 Tbsp freshly grated nutmeg 
salt 
pepper 
3 Tbsp flour 
2 Tbsp tomato purée 
4 oz pitted prunes, sliced 
14 fl oz veal stock 
1 bouquet garni 
1 to 
2 Tbsp Dijon mustard 
2 cooking apples


Instructions:
Marinate the meat in 3/4 pint of the beer for 3 days. Lift the meat out of the marinade, reserving the marinade. Heat the oil and butter in a large, heavy-based frying pan, add the meat, sugar and nutmeg and cook over a medium-high heat, stirring frequently, until the meat is well browned. Using a slotted spoon, transfer the meat to a casserole and season with salt and pepper.
Stir the flour into the oil and butter and cook until well browned, then stir in the tomato purée, prunes, veal stock, bouquet garni and the beer marinade. Bring to the boil, skim and then pour over the meat. Simmer very gently until the meat is tender, about 1 hour. Stir in the mustard and the remaining beer, then taste and adjust the seasoning. Peel and quarter the apples, add to the casserole and cook for 5 to 10 minutes, until the apples are tender. Serve hot.
No beer!? Hmmm.

Well, I can't think of anything that would give you the same flavor, and as a component of the dish it looms quite large...3 day marinade in beer? No way to replace that, and brown ale is distinctive and nutty. 

Beer and wine are natural tenderizers, which is what the marinade is for...They're some of the only ones that aren't acidic (buttermilk and yoghurt are others...Obviously not a good choice here) so filling that role without changing the character of the dish is going to be a serious challenge.

Are you looking for a non-alcoholic substitution, or just a non-beer one?

Since tomatoes and apples feature, you might try marinating in cider or tomato juice (depending on which flavor you want to push). You won't want to marinate for anywhere near the same amount of time: those two are acidic enough to digest your meat after 3 days. Might try apple cider and apple cider vinegar mixed. Vinegar marinated beef has an interesting twang to it.