Rinse zucchini and coarsely grate into a suitable bowl. Peel and squeeze the garlic clove. Mix sour cream with pepper, salt and juice of one lemon.
Put grated zucchini in a sieve and drain. Place in a large enough bowl, mix well with egg, thyme, garlic, cornstarch and a pinch of nutmeg, season with pepper and salt. Heat butter in a frying pan and fry four small zucchini cookies in it until golden brown on both sides.
Arrange zucchini cookies, sour cream and beef ham decoratively on a plate.
Tip: The flesh of young, small zucchini is much more tender than that of larger ones.