Saliva as a food ingredient is not an entirely new concept. (See the item here on saliva noodles.) For an earlier take, sample Nicholas Robinson’s book
TREATISE ON THE VIRTUES and EFFICACY OF A CRUST of BREAD, Eat early in a Morning Fasting: To which are added, Some particular REMARKS concerning CURES accomplished by the SALIVA, or FASTING-SPITTLE, 4th edition, London, 1763.
