Willm produces eaux-de-vie and liqueurs made with the greatest respect for tradition and fruit from their orchards. Distillation takes place in copper stills heated by a water bath, using two possible methods depending on the fruit (twice distilled or one column distillation). Expertise and experience are essential to collect only the heart of the distillation, the essence of the fruit.

Crème de cassis, also known as Cassis liqueur, is a sweet, dark red liqueur made from blackcurrants. Several cocktails are made with crème de cassis, it may also be served as an after-dinner liqueur or as a frappé.