Trader vics grog is a classic tiki drink from a founding father: victor bergeron, of the trader vics chain of polynesian-inspired, kitch-laden bars and restaurants. We prefer this tweaked recipe from beachbum berry remixed, which calls for passion fruit syrup instead of the harder-to-find juice. You can use whichever you have on hand or even try passion fruit puree, which has a sweetness level somewhere between the syrup and the juice.