Defrost the spinach. Clean and dab the mushrooms dry. Remove stalks. Peel garlic and press it through a garlic press. Heat 1 tablespoon of oil. Steam garlic in it until transparent.
Add the spinach and heat. Season with salt and pepper. Fill the spinach into the mushrooms. Wrap with bacon and pin. Heat 2 tablespoons of oil. Fry the mushrooms all around for about 5 minutes. Season again with pepper.
It goes well with bread.