Fry the bacon in a wide pan or a frying pan (with lid) without fat until crispy. Remove and drain. Drain fat, except for 2 tbsp.
Peel and finely dice the onion and garlic. Fry them in hot bacon fat until translucent. Add frozen spinach and milk, cover and cook over a low heat for 15-20 minutes. Stir occasionally
Cook the spaghetti in plenty of boiling salted water for about 8 minutes until al dente. Peel the shavings from the Parmesan with a peeler
Season spinach sauce with salt, pepper and nutmeg. Drain the spaghetti and mix with the spinach sauce. If necessary, break the bacon into pieces and sprinkle with the Parmesan
Drink: mineral water