Mix the flour, salt, sugar, butter and 6 Tablespoons shortening together with a fork or your hands. Add the water in increments until a smooth dough results.
Roll the dough out to 1/4" thickness and cut into 4x6" rectangles.
Spread strawberry jam onto a rectangle of dough, avoiding the edges by 1/2". Place another rectangle overtop and press the edges together with your fingers or a fork.
Place the pop tarts onto a lined baking sheet and bake for 12-15 minutes until golden brown.
Allow the pop tarts to cool completely before frosting.
To make the homemade pop tart frosting:
Combine the candy melts and 1 TB shortening together in a small bowl and microwave in 30-second increments, stirring well in between each heating, until smooth.
Spread the candy melts onto the pop tarts and add the hearts in a card pattern while the candy melts are still wet.
Allow the candy melts to dry completely before storing or serving. Makes 4-6 pastries.
Notes
Note: Nutrition information is a rough estimate only; actual values will vary based on the exact ingredients used and amount of recipe prepared.