Mix the diced strawberries, granulated sugar, corn starch and lemon zest in a small bowl and set aside.
Unroll the pastry and cut each pie crust into 8 rounds with a 3.5-inch round cutter (or any shape/size you like). You should end up with 16 rounds.
Place 1 tablespoon of strawberry mixture in the middle of 8 of the pastry rounds. Top with the remaining pastry rounds, then use a fork to seal around the edges.
Poke holes in the top of each hand pie with a fork.
In a small bowl whisk together the egg and cream. Brush over the hand pies.