Well, again, THANKS, everyone!
I did have a candy thermometer and the temp was 220 for a long time, but I guess I didn't have enough pectin in there (I left the peel on, but I did core and seed the apples - NOW I know!)
I boiled it so long, trying to get to the set point, that there was no flavor left to the goo at all, just some sweet. I had to toss it, it was gross.
I very much appreciate all the help, and Gretchen, I love blueberry jelly, so I will try that next time!