Defrost spinach at room temperature. Wash pumpkin, remove seeds, dice flesh finely. Peel and chop onion and garlic. Heat oil and fry garlic, onion and pumpkin for about 3 minutes. Season with salt.
Let the dough sheets rest at room temperature for 15-20 minutes. Season ricotta with salt, pepper and nutmeg to taste. Stir in egg. Melt butter. Squeeze the defrosted spinach well in portions.
Spread a moistened tea towel on the work surface, place a dry one on top. Unroll the dough sheets on the prepared cloths. Spread a third cloth on the work surface. Place a sheet of dough on top, spread a thin layer of butter on it and repeat the process with 4 more sheets of dough. Sprinkle with 2 tbsp. breadcrumbs. Spread half of the spinach on top, leaving about 4 cm free around the edges. Spread half the ricotta and pumpkin on top.
Wrap the short ends of the dough sheets and roll them up into a roll from one long side. Place on a baking tray lined with baking paper. Repeat the process with the remaining ingredients. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 35 minutes. Arrange the finished roll. Serve with sour cream and salad.