What is a “soupe angevine”?

“Soupe angevine” is a French cocktail typical of Anjou in the Loire Valley. It is composed of lemon juice, Triple Sec liqueur, cane sugar and Crémant de Loire (sparkling wine such as Vouvray wine). This cocktail gave birth to a luxury version called “Soupe de Champagne” (simply replace Crémant by … Champagne).