In a measuring cup, add the cold water and apple cider vinegar along with an ice cube and set aside.
In a large bowl, add the all-purpose flour, pastry flour, sea salt, cinnamon, and organic pure cane sugar, whisking them all together.
Add the cubed vegan butter sticks (or regular vegan butter) and using a pastry blender, blend butter into dry ingredients until the mixture becomes “peas-like” and crumbly.
Pour the cold apple cider vinegar-water mixture (slowly + without the ice) and stir (working it together with one hand) until the dry ingredients are moistened. **NOTE: If the ingredients feels a little too dry, add 1 Tbsp of cold water at a time, until it’s moistened BUT not too wet!**
Now, shape the dough into a ball and wrap it in plastic wrap and flatten it slightly and chill for at least 1 hour.
In the meantime, make the Strawberry Jam Filling (See Notes in Recipe for Homemade).