2: Weigh 125 g egg, then whisk briefly until liquid. Note: once liquid, it is easier to adjust the weight more precisely if necessary. Use up any egg left over for glazing in another recipe.
10: Bake for 15 minutes. Leave to cool on a wire rack. :Note: To help keep the pastry crisp, you can use this technique.
11: When both the filling and pastry case are cold, pour the filling into the case, level the surface by tapping the sides, then put to set in the fridge for at least 1 hour.
13: Colour the top of the meringue, either by putting the tart under a hot grill for a few seconds, or by using a torch. Decorate with a few shreds of lime zest.
Remarks
You can use the same recipe to make a lemon meringue tart, but you will not need colouring. If you don't have time to make Italian meringue, normal meringue will do just fine.