5 Napkin built its reputation as well as its growing fleet of burger brasseries – the fourth 5 Napkin opens in Boston in a month and a fifth in Miami Beach’s South Beach soon after – on chuck meat. Even so, the introspective D’Amico was thinking the unthinkable: chucking some of the chuck.

D’Amico was restless. A chef with a passion for exploring new ideas, he was having a difficult time savouring the success of repetition, doing the same thing over and over again.

So where do you go after a 5 Napkin Burger? A 6 Napkin Burger? No, D’Amico decided to break the monotony of chuck by adding new cuts into his mince (ground beef) mix. He was after a beefier, steakier burger.

How, I’ve often wondered, did the unsung neighborhood Irish pubs of New York turn out such outstanding chopped steak burgers?  They weren’t sourcing locally and expensively from New York-area butchers (Pat LaFrieda, David Schweid) now as famous as the hot restaurants they supply (Minetta Tavern, Spotted Pig, Ai Fiori). D’Amico suspects the pubs relied on unsellable and therefore cheap cuts and scraps dumped by the national meatpacking plants. Who knew this was the stuff that great burgers were made of?

D’Amico’s idea was to incorporate somewhat leaner scraps of sirloin and, though no longer a bargain, hanger steak (thick skirt in the UK, onglet in France) into his chuck. To keep the fat content of his burgers at a steady, 5-napkin-worthy 20 percent D’Amico asked Schweid to supply him with a fattier blend of chuck than usual.

On 11 February 2011 at 11:38 AM D’Amico served me one of the first prototypes.

This photo does not lie: D’Amico’s new burger was deep-flavoured, as intended, and hit the 6-napkin mark, even if this was unintended. Importantly, it was black, crusty and caramelized like a steak on the outside, despite the deep-pink interior. The high contrast in colour and texture reflected an ideal that has eluded some burger chefs in New York and many more beyond the city line. I’ve yet to find a Londoner who can get the rouge et noir effect just right.

Not all burgers have to be crusty. On the same trip I introduced myself to the bash style burger, accessorized with caramelized onions, bacon jam, pickles, American (yellow) cheese and special sauce, at the new gastro winepub (not my term) Burger & Barrel on the northern frontier of Manhattan’s SoHo. Forget napkins: For this baby they should equip you with a disposable raincoat. When you’re devouring this sponge of succulent beef you’re not too bothered if there’s not much of a crust.The B&B bash burger, for all its messy merits, was no New York chopped steak burger. For that you have to have the blackened surfaces of D’Amico’s prototype.

Will D’Amico risk disappointing his most loyal regulars by replacing his 100-percent chuck burgers with the final version of his new blend? Will he commission a UK counterpart of that blend when he brings 5 Napkin to London in July for my BurgerMonday pop-up? In both instances he’ll have to convince himself first and his untroubled partners second. For them the success of repetition is leaving only a sweet taste.