Classic Spinach Lasagna

• 1 ricotta
• 1 egg
• 1 nutmeg (whole)
• 1 parmigiano (freshly grated)
• 130 gr round of beef (ground)
• 110 gr made lasagna noodles (freshly)
• 90 gr spinach (fresh)
• 34 gr chicken livers
• 34 gr tomato paste
• 32 gr pancetta