In a large saucepan add all the filling ingredients, except baby spinach. Cook on medium-high heat for about 15 minutes, stirring often, until the meat has browned and all the liquid has evaporated.
Add the baby spinach leaves and stir to combine and wilt the spinach leaves. Taste and adjust salt and spice levels to your liking. Set aside to cool.
Preheat oven to 400F (204C).
Unroll the one thawed pastry sheet and cut into approximately 12 squares about 2-inch square in size.
Add 1-2 tsp of the filling mixture into the pastry square - making sure to pick out the large pieces of ginger and peppercorns as you go. Fold over into a roll pinching the edges to seal the patty. (Feel free to make them any shape you like. But this is what my mom does, so that's what I like to do too!)
Set aside on a parchment lined baking sheet and finish rolling all the patties. Make sure the patties are a few inches apart as they will expand when baked.
Optional - for an even flakier patty, refrigerate the prepared patties for at least 30 mins to allow the butter in the puff pastry to firm up again. This will help get a much flakier crust when baked.
Brush the patties with some egg wash and bake for 20 minutes or until golden brown on top.
Serve immediately or allow to cool and freeze for later.
When reheating - cook from frozen. Bake at 400F for 10-15 mins till warmed through. Serve warm.