Take the frozen pastry shells out of the freezer to thaw for about 10 minutes.
Meanwhile, combine the pudding mix and milk in a medium bowl and blend with a hand mixer or whisk by hand for 2 minutes. Set aside for 5 minutes to set.
Lay out the thawed shells on a work surface and spoon about 2 teaspoons of pudding into each one.
Top each filled shell with fruit and optional lemon zest.
Serve immediately or keep in the refrigerator until ready to serve.