Except for mole sauce in Mexican cooking, it’s quite rare to find chocolate used in savoury food preparation.   Which is just one more reason to attend this Thursday’s chocolate-lovers wine dinner at One Bar in Exchange Square.  Like the magical chocolate waterfall in Charlie and the Chocolate Factory, this five-course menu is every chocolate aficionado’s dream come true. Arrive at 7.30pm sharp to make sure you don’t miss out on the canapés: smoked swordfish in mini chocolate rolls; chocolate cookie with gorgonzola and parmesan chocolate tuille- all paired with a welcoming glass of Pinot Grigio. The sit-down dinner includes exotic combinations such as Tasmanian rock oyster with chocolate jelly; chestnut and goat cheese tortelli with chocolate coulis; and a pidgeon and white polenta with chocolate-scented smoked chili negro sauce. $698 + 10% per person.  Level 3, One Exchange Square, 8 Connaught Place, Central, 2522-2246.