Ok, my confession: I don't actually have a pattern for the pie written out. I sort of made it up as I went along and figured that if it did, by some amazing miracle, get chosen for the SnB book, I would deconstruct it and get a firm pattern that way.
But, it was a super, super easy pattern (I am a crochet novice), here's a basic run down:
For the Crust:
make 2 triangles of single crochet, I think I chained 2, then did 2 sc in the second chain from the hook. Then it was 2 sc in each of those sc, then from there, 2 sc in the first and last sc of each row, to desired size. One triangle should be slightly smaller than the other, maybe a row or two less than the bigger triangle.
Then you need to cut a triangle of light cardboard, slightly smaller than your smaller triangle - sew the two triangles together, the smaller centered on the larger, with the cardboard sandwiched in between (this is to give the lid shape and structure).
For the bottom crust, you start out making a triangle to the same size as your larger top triangle, then keep crocheting, without any increases, to the desired height of your pie. Once you have the side crust as tall as you'd like, make the crimped edge by doing 1 sc, 1 dc in the first sc, then 1 dc, 1 sc in the next, and repeat to end (you'll have to make sure that you have the right number of stitches to get this to work out evenly across).
For the Filling:
the filling is basically just one long rectangle that is the width of your pie crust side, and the length of the two longest sides of your larger triangle... For my cherry pie, I used a variation of a cluster stitch that I found on about.com. I basically just played around with different clusters of different types of stitches until I found one that I liked. I think for this pie, it was clusters of 3 tr. I offset the clusters for every other row, so that I wouldn't end up with straight horizontal lines of cherries once the slice was assembled.
Fillings options are endless, I imagine... do smaller clusters for blueberry pie or forget the clusters and just do a smooth yellow for a lemon meringue (of course, you'd need to create a crochet meringue to go on top).
stitch the edge of the top crust (smaller triangle side down) to the bottom crust, just bleow the crimped edge. Stitch the filling to the bottom crust at the side and the bottom.
Voila! Secret Slice!
This pattern could stand a lot of improvements, the filling could be sturdier, and I think if I made it again, I would try to make a rounded edge instead of a straight edge for the back of the pie. But hey, experimention is half the fun!