If you haven't already, remove the stems from the cherries and pit them. I find that using a metal straw is an easy way to pit them if you don't have a cherry-pitting tool.
Cut 1/3 of the cherries into halves, 1/3 into quarters, and the remaining third left whole. This will help to keep the pie filling intact.
In a medium saucepan, combine the cherries and cherry juice, sugar, apple cider vinegar, almond extract, vanilla extract and Clear Jel together over medium heat.
Simmer for 15 minutes, stirring occasionally, until the cherry mixture is thick and glossy, and you can see the bottom of the saucepan when scraping it with a spoon.
Remove from heat and mix butter into the cherries, stirring constantly until it is combine. Set aside to cool.
While the pie filling is cooling, make the pie crust. In a large mixing bowl, combine the flour, salt and shortening and rub between your fingers until it resembles coarse breadcrumbs.
In a separate bowl, mix the egg, vinegar and water together.
Make a well in the center of the flour mixture and pour in the egg mixture. Mix the dough until well combined.
Divide the dough into two equal parts and roll out dough until about 1/8 inch thick and 1½ inches larger than the pie pan.