Guylian an international Belgian brand available in more than 120 markets presents the Opus assortment The Guylian Opus is an assortment of pralines with 8 different fillings: pear & mango ganache, soft caramel, cappuccino cream, original praline, crunchy biscuit & vanilla cream, smooth truffle, truffle roasted hazelnut and original praline roasted hazelnut.