Pastry: Add the flour and salt to a mixing bowl. Next, add the chilled butter and cut it in using a fork or pastry cutter until it looks like a coarse meal. Pour in the cold water and stir to combine using a wooden spoon or until it forms a smooth dough.
Shape the dough into a 1-inch thick rectangle and wrap it in plastic wrap. Place in the refrigerator and chill for at least 2 hours or up to 24 hours. In the meantime, prepare the pecan filling.
Pecan filling: Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
To a small bowl, add pecans, 1 and 1/2 tablespoons of maple syrup, salt, cinnamon, cardamom, ginger, and cloves. Stir to coat the pecans with the spices.
Transfer the pecans to the prepared baking sheet and spread them into an even layer. Roast for about 8 minutes. Let the pecans cool completely.
Add the cooled pecans to a small food processor and add the remaining tablespoon of maple syrup, coconut sugar, and vanilla extract. Process for 5-10 seconds or until it forms a thick paste. It doesn't have to be smooth. A little bit chunky is okay.
Assembling: Remove the dough from the refrigerator and flatten it into an 11x8-inch (28x20 cm) between two sheets of parchment paper. Cut into 12 equal rectangles. Transfer half of the rectangles to a baking sheet lined with parchment paper, leaving about 1 inch between each (pop tarts won't spread a lot).
Place about 2 teaspoons of the pecan paste filling into the center of each rectangle, leaving about 1/2 inch of space near the edges.
Place the remaining rectangles of dough on top of the filled rectangles and use a fork to seal the edges. Prick the top of the pop tarts once with a fork to create holes (to let steam escape). Refrigerate the pop tarts for 20 minutes in the refrigerator or 10 minutes in the freezer.
Preheat oven to 350°F (175°C). Once pop tarts have chilled, bake for 20-25 minutes or until just golden brown.
Let pop tarts cool for at least 15 minutes before enjoying! You can eat as is or drizzle with the optional vanilla glaze.
Vanilla Glaze
Add the powdered sugar, water, cinnamon, and vanilla to a small bowl. Whisk until smooth. The glaze should be thick but pourable. If it's too liquid, add more powdered sugar. If it's too thick, add more water.
Use a spoon to glaze the pop tarts. Let the glaze harden at room temperature for about 30 minutes.