Preheat oven to 400 degrees. Lightly grease a baking sheet.
In a medium pot, over medium heat, melt butter and whisk in brown sugar. Add diced pumpkin, apple, pear, and spices. Mix well, cover, and cook until pumpkin and fruit softened. Strain and set aside.
Cut each pastry sheet in 4 equal squares.
Divide filling among 8 squares, placing it in the center.
Bring corners of the square together to form a triangle. Wet your fingers and run along the edges on the inside for better seal. Press the edges of the triangle pastry together.
Lay pastries on the baking sheet and brush lightly with the egg wash.