I remember being served something referred to as apple jacquette in 1970 or thereabouts, also that it was pretty good, and that is how it came to be mentioned in Blue Moose...but I don't remember exactly what it was like. It had apple. It had a pastry component, maybe similar to strudel, maybe not. It might have had cream, or possibly some variety of pot cheese. I wouldn't be surprised if it had some cinnamon. It could have been a little like apple crisp. I did a quick google, as you probably did too, and found nothing. I think given your name you'd be within your rights to invent apple jacquette. There are only so many logical things to do with apple and pastry--and they all work! Maybe a few raspberries?