What do I do with mildly fermented maple syrup? Our organic grade A maple syrup, bought in bulk, has gone slightly fermented in the fridge. If I were still in college, this would be great, but I am a bit older. What do I do with this stuff? Can I assume it is fine in baked goods? How can I accelerate my usage of it?
Yeah, syrup can ferment + convert sugar to alcohol. It has more of a tendency to do so if the sugar content is lower -- I tend to err on the side of overconcentrating my syrup.

You can try boiling it for a while to see if the alcohol boils off + if the flavor is OK then use it... but I'd boil down a bit more first, to make sure the sugar content is back up to standards. Either boil until the boiling point is 7 degrees F higher than the boiling point of water at your altitude, or boil until the syrup "aprons" (e.g. starts to drip in a sheet rather than discrete drops; a flat edge of a metal spatula works well), with the former being more accurate if you have a good thermometer.

If the flavor remains after boiling, then try using in recipes -- perhaps in brownies/blondies or with ice cream.