Prepare the mascarpone cream: put mascarpone, gorgonzola, parmesan and a little salt and pepper in a bowl and mix (you can add 1 tablespoon of milk if it seems too firm).
Cut the rectangular sheet into strips of 3-4 cm: take 1 strip at a time, stuff half of it (lengthwise) with the cream, cover the cream with grapes, then close the other half of the sheet over the filling, which should only protrude a little.
Continue like this with all the strips (consider that about 1/3 of the cream you will need for the bottom of the quiche).
Use the round pastry to line the mold covered with parchment paper, distribute the remaining cream on the bottom, then start placing the strips of stuffed pastry on top, creating a spiral design.
Once all the strips are in place, brush with a little milk and cook for about 20 minutes or until golden brown in a preheated convection oven at 220 ° C.
The spiral savory pie with grapes is ready, let it at least cool before serving.
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