Cannelloni With Cheese& Spinach

• 18 sheets lasagne (fresh)
• 1 free-range egg yolk
• 1 nutmeg (freshly grated)
• 450 ml cheese sauce
• 160 gr mascarpone cheese
• 130 gr ricotta cheese
• 60 gr mozzarella cheese (grated)
• 30 gr bags of microwave in the bag (fresh)
• 14 gr parmesan cheese (freshly grated)