A molding apparatus for producing a biological tissue embedded in a block of an embedding material. The molding apparatus comprising a mold comprising a compartment configured for containing the embedding material. The compartment having a compartment floor and at least one wall extending upwards from said compartment floor. The compartment comprises at least one depression extending downwards from the compartment floor. The molding apparatus further comprising a sample sheet configured to attach to the biological tissue and hold the biological tissue thereon. The sample sheet being further dimensioned to be positioned in the compartment and to be constrained to the position thereof, at least along one direction, by the compartment. The depression is configured for accepting the biological tissue at least partially therein. Thereby the molding apparatus being configured for producing a block of an embedding material having at least one protrusion associated with the at least one depression wherein the biological tissue, attached to the sample sheet, is embedded at least partially in the protrusion.