Pumpkin & Mozarella Lasagne

• 30 cm
• 20 cm lasagne dish
• 1 onion
• 1 clove of garlic
• 1 kg pumpkin
• 300 ml sour cream
• 140 gr mozzarella cheese (grated)
• 28 gr margarine
• 18 gr sage (freshly chopped)
• 18 gr chives (freshly chopped)