Set a heavy bottomed sauce pan over medium high heat. Add pitted cherries, butter, sugar, lime juice, crushed cardamom, vanilla extract to the pan and bring to boil.
Cook for around 8 minutes or until the cherries have softened. Use a fork to mash some of the cherries.
Take about two tablespoon of cherry syrup out of the pan into a small bowl. Add corn starch into this syrup and make a slurry.
Add the prepared slurry back to the saucepan and cook the cherry filling for two more minutes.
Turn the heat off and let the filling cool in the refrigerator. Preheat your oven to 375 degrees F
While the filling is cooling, sprinkle some flour on your kitchen counter and unroll the pie dough. Cut out heart shapes from pie crust. If you use a medium sized heart shape cookie cutter, you should have 32 heart shaped pie crust pieces.
Line two cookie sheets with parchment paper. Lay 16 heart shaped pieces on the lined cookie sheets.
Take the filling out of the refrigerator and add about a teaspoon of filling in the middle of each pie crust piece.
Take the remaining 16 heart shaped pie crust pieces and while working with one piece at a time, wet the edges with water and cover the piece with cherry filling in it.
Seal the edges and use a fork to crimp them. Use a sharp knife to make 2-3 cuts in the hand pie (see pictures). Repeat for alll 16 hand pies.
Mix some water with heacy cream (if using) and using a pastry brush, brush each hand pie with this cream and water "glaze". Sprinkle some coarse sugar on each hand pie.
Stick the cookie sheets in your pre heated oven and bake for 25 minutes or until golden brown.
Remove the cookie sheets from teh oven and let the sour cherry hand pies cool on a cooling rack for 10 minutes.
Enjoy and Happy valentine's day to all
Notes
½ cup sugar is just enough to offset the tartness of sour cherries. If you want to make the filling sweeter, feel free to add more sugar.