The invention relates to an apparatus and a method of freezing a liquid substance contained in at least one receptacle, comprising the steps of: providing the liquid substance in at least one receptacle, providing a cooling chamber and a cooling device having a cooling surface setting the temperature of the cooling surface, starting a freezing procedure by placing the receptacle with the liquid substance therein on the cooling surface to form a seed or initial zone of nucleation and continuing the freezing procedure to completely freeze the substance.
