In his tasting trials he described the marriage of chocolate and pinot gris as a "disaster". However, he discovered other combinations, such as his Reserve chardonnay and white chocolate, were far more complementary.
"We found that the creamier white wines combined with white chocolate very harmoniously, whereas styles that rely on higher acidity struggled," he notes.
"With dark chocolate and higher cocoa solid percentages, rosé and pinot noir's loaded berry flavours became a sweet accompaniment, with a parallel between the tannins in pinot noir and the bitterness of dark chocolate."
Ripeness in a wine is crucial, thinks Key, who advises steering clear of "anything too old, savoury, dusty, herbal, green or acidic", which are unsympathetic to chocolate.
I agree that wines with sweetly ripe fruit are the recipe for success, such as Central Otago pinot noir, Australian shiraz and other New World reds.
Chef Richard Hingston has been putting plenty of thought into some sweet and savoury synergies of late. He's been masterminding a chocolate-themed degustation menu that kicks off Christchurch Casino's Chocolate Month.
"If you know your products then it's not so difficult to get some good matches," he maintains.
"You've also got to remember that there is a huge range of different chocolate as well: from cocoa powder and nibs, which contain no sugar, to white, milk and dark."
One of the more radical matches he's made is grilled salmon encrusted with herbs and cocoa nibs, served with a white chocolate bearnaise, mango chutney and a salad dressed with raspberry and bitter chocolate vinaigrette, paired with Allan Scott "The Wallops" Marlborough chardonnay.
Daring and potentially delicious wine and chocolate matches like these are something of which I definitely approve. Far better than lobbing a load in the wine itself.
LIKE WINES FOR CHOCOLATE
SWEET WITH WHITE CHOCOLATE
Allan Scott "The Wallops" Marlborough Chardonnay 2010 $29
A chardonnay with some creaminess has an affinity with white chocolate, such as this elegant example - Hingston has paired with his salmon and its white chocolate bearnaise - in which grapefruity freshness is counterpoised by rich toasty notes. (From Glengarry, La Barrique, Mount Wine Barrel Tauranga, Advintage, Kumeu Cellars.)
SWEET SUCCESS
Gibbston Valley "Late Harvest" Central Otago 2011 $30 (375ml)
While judiciously selected dry wines can work with chocolate the most successful matches are with sweeter styles, such as this tangy apricot-packed blend of riesling and pinot blanc, whose notes of orange zest are echoed in its pairing with Patagonia's milk chocolate with citrus peel and caramelised nuts. (From Gibbston Valley cellar door, Glengarry Victoria Park.)
ULTIMATE MATCH
Valdespino El Candado Pedro Ximenez Sherry $$27.99 (375ml)
The concentration of this veritable fruitcake in a glass, with its notes of rum and raisin, nut and candied peel can take on the richest of chocolate fare. (From Glengarry.)