Chartreuse (liqueur) was not a secret but well known. At the death of the pharmacist, his heirs returned the manuscript to the monks who had been back at the Monastery since 1816. In 1838, they developed Yellow Chartreuse, a sweeter version of the Green Chartreuse, 40% alcohol liqueur (80° proof). The monks were again expelled from the monastery following a French law in 1903, and their real property, including the distillery, was confiscated by the government. The monks took their secret recipe to their refuge in Tarragona, Catalonia, and began producing their liqueurs with the same label, but with an additional label
Chocolate liqueur A basic modern recipe for making chocolate liqueur at home lists the ingredients chocolate extract, vanilla extract, vodka, and simple syrup. To keep the chocolate extract in suspension and make the liqueur thicker, glycerine may be added. In its purest form, chocolate liqueur is clear; coloring may be added. Recipes for home-made chocolate liqueurs may also include raw eggs as an ingredient, presenting a risk of salmonellosis. Reasonable safety may be achieved by combining the eggs with the alcohol before other ingredients. Earlier, liquor was made by adding the cocoa beans to classic liqueur. Modern chocolate wine can be considered