Responsa על עבודה זרה 110:4

Q - Is grape honey that was produced by a Gentile, permissible, if there was no intent on the part of the Gentile, during the process of manufacture, to squeeze the juice from the grapes; rather were the grapes crushed in a manner that would enable the mash to absorb the chemical used for congealing the grape honey?
A - The grape honey is permissible. However, if the Gentile squeezed the juice from the grapes, strained it and then added the chemical, it is forbidden. If, as R. Shemarya related to me, it later becomes congealed, it is then permissible.