Giffard Creme Passionfruit liqueur is one of their sweeter styled ("creme" liqueurs usually being sweeter in profile), presenting in a golden orange. They recommend drinking as an aperitif or with wine.
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.