Heat the spinach in the saucepan. Season to taste with salt, pepper and nutmeg. Make a smooth dough from flour, olive oil, water and a level teaspoon of salt. The dough should no longer stick, if necessary give in a little flour.
Roll out the dough thinly to the size of a baking sheet, lay out on a baking sheet and spread evenly with creme fraîche. Spread the spinach on top in blobs. Roughly dice the Gorgonzola and tomatoes and spread them on the dough as well.
Dust again with freshly ground pepper. Bake the whole thing at 230 ° C (top / bottom heat) for about 20 minutes.