roll out the dough onto a floured surface. cut out 8 hearts using a cookie cutter. you can also make other shapes if that's what you prefer

cut the strawberries into small pieces and put into a bowl. pour the sugar over the strawberries and mix together. Let the strawberries sit in the sugar for at least 10 minutes. A sugar sauce should start to form. This is called letting the fruit "macerate"

mix in the Grand Marnier and lemon zest (optional)

Using a slotted spoon, put a small amount of the strawberry mixture into the center of 1/2 of the heart shapes (the other half will go on top)

place the tops on each tart and use a fork to seal the edges

brush the top of each tart with a little milk to help them brown up in the oven

pierce the top of each tart with a fork

Bake according to box directions (approximately 15 minutes at 350 if not otherwise specified)--until the crust is golden brown

enjoy!