Mathilde Cassis Liqueur is a French blackcurrant liqueur produced by Maison Ferrand using Noir de Bourgogne and Royal de Naples blackcurrants. The fruit is infused in alcohol for an extended period before bottling at 16% ABV. It typically retails for about $26.
Gummy and cloying and overwhelming with sugar, this ultra-sweet liqueur eventually allows a hint of acidity to shine through as the finish develops — but the extracted, pruny sweetness seems to endure forever.