Miami Dolphins -- Rookies Foot Dinner Tab ... at $740 a HEAD!!!

It's the LAST tab you'd ever wanna pick up -- a bill for a lavish steak dinner consumed by the heavyweights on the Miami Dolphins offensive line -- but Monday night, several unlucky rookies did just that ... and it cost 'em $7,400.

All told, there were 10 players at the dinner at Prime One Twelve steakhouse in Miami Beach -- fresh off their Sunday night victory over the Bengals -- meaning the average cost per head was $740.

Dolphins guard Richie Incognito tells us, they ordered practically everything on the menu -- including Wagyu beef, which runs $35 AN OUNCE ... in addition to a full array of appetizers, expensive wines, and of course ... lemon drop shots.

Incognito tells us, the guys go out for dinner several times a year as a bonding experience -- and it's a tradition to make the rookies pay for one of those meals.

We're told the rooks split the bill based on their salaries -- which means starting right tackle Jonathan Martin paid the most.

Champagne problems ... in this case, Dom Perignon.