I have a Badger Insinkerator Model 5-81A. I put some asparagus ends into it to dispose of them. They were ground up but water is now coming back up when I turn it on. I have lost the directions and think that an Allen wrench is used in the center of the bottom of the unit to turn it by hand and dislodge what is stuck. Is that right. I pressed the reset button which helped a bit but there is still standing water.

Yes..an allen wrench was supplied with this unit (I believe its just a standard 1/4 " allen) it goes underneath, in the center, and turn in both directions to free clogged unit(do not turn power on while doing this!)
I would also check your trap..could be installed to high, and letting water stand in diposer (or just clogged trap)

Yes that is right. keep turning the allen wrench untill it turns easily. then push the reset hard and try it. you dhould hear the unit run. if its running and you still have standing water, the the drain lines have plugged.