Here is a turnover, fresh from the oven, cut open.
Remarks
The tricky part of this recipe is to make the turnovers with as much filling but as little dough as possible. At first, it is tempting to put only a little filling so that the dough is easier to close. Made like this, they are rather stodgy, but practice makes perfect.
The filling can be varied as you choose, so let your imagination guide you.
The turnovers can be frozen, after glazing with egg for the first time. Before cooking, leave them to thaw out, then put to rise in a warm place and finish the recipe as normal.