Defrost the spinach. Clean the mushrooms, removing the stems. Preheat the oven to 200 ° C. Wash the lemon with hot water, rub the peel and squeeze out the juice. Chop the garlic. Squeeze out the defrosted spinach vigorously.
Add garlic, 1 teaspoon lemon zest and cream cheese and season with pepper, salt and lemon juice to taste. Then stir in the raw egg vigorously. Pour the cream cheese mixture into the mushroom hats and wrap the ham around them. Place in a casserole dish that has been coated with butter and cook in the hot oven for about 15 minutes.