Put 500 g flour, 1/2 teaspoon salt, 1 egg, milk, 1/8 l oil and 100 ml water in a bowl. Knead first with the dough hooks of the hand mixer, then on the floured work surface with your hands until smooth.
Cover the dough with a damp cloth and let it rest for about 45 minutes.
Place the ricotta in a sieve and drain well. Grate the Parmesan finely. Finely dice mozzarella and ham. Wash and chop the parsley. Stir ricotta and 4 eggs until smooth. Mix everything with mozzarella, ham, parmesan and parsley.
Season with salt, pepper and nutmeg.
Coat the springboard (approx. 30 cm Ø) or springform pan (approx. 28 cm Ø) with oil and dust thinly with flour. Roll out approx. 2/3 of the dough on some flour round (approx. 40 cm Ø). Pour into the form, press down the rim.
Spread the filling over it.
Halve the remaining dough. Form half on some flour to a long roll (approx. 95 cm). Place on the filling at the edge of the mould and press down lightly. Fold the dough over the roll towards the middle.
Roll out the rest of the dough onto some flour. Cut out or cut out strips and place them on the cake as a grid.
Whisk 1 egg, spread on the cake. Bake in the preheated oven (electric cooker: 200°C/circulating air: 175°C/gas: level 3) for approx. 50 minutes.
Drink tip: strong red wine, e.g. Apulian Negroamaro.