On Christmas Eve, I made a Steak and Ale casserole and used half a bottle of Newcastle Brown Ale. I put the lid back on the beer and put it in the fridge. Will it still be ok to use in another casserole tomorrow?
I suppose it's now flat but will it have 'gone off'? Does beer go off?
Beer can go off as it isn't that high in alcohol, but 24 hours ain't going to be an issue, especially in the fridge. When cooking with ale how bubbly it is isn't really the issue.
It appears that an open bottle, with the cap just pressed over the top and refrigerated, can last quite OK up to 4 days before being finished. As would be expected, the sooner you can drink it the better. But, if you're really pressed, you can come back and still find a beer quite worth drinking after 96 hours.
Be sound Tills it is going to reach a temperature that renders it free of harmful bacteria, but I would not chance necking it. I have used wine that has been opened for a week, or two in cooking, and am still here to tell the tale.
Heck, I've necked wine that was opened a week earlier and left on the worktop. Sometimes it's improved. But if course it has a higher alcohol % volume.