Creme de Cassis Imperial is one of the creme liqueurs offered by Giffard, which implies a higher sugar content than normally associated with many liqueurs and designed for the sweeter palate. The anjou is 100% natural and steeped in French blackcurrants.The Imperial expression is made from a lightly higher proof than the Anjou with blackcurrants specifically from the Val de Loire.
Giffard is a French company specializing in a wide variety of liqueurs and eua-de-vie among other products. Some of those extra products are flavored cocktail syrups (or "sirop"). They are generally sweetened with pure cane sugar.