"The phone is just non-stop," says Hamish Mellor, as he checks on early harvests of Fenland celery.
"I'm getting two lives in one," says grocer Steve Moore, describing his plans to move to Chile in 18 month's time after 40 years at the Market.
The entrance, just a short stroll from Clapham North tube station, barely merits a second glance.
"We're feeding about 5,000 people a week. About 3,000 canapés are going out today," explains Jeremy Redgewell from Eden Caterers, as he loads up their van.
In this health-conscious era, the nation's appetite for salad is insatiable.
As London wakes each morning, the teams at Pod - a fast food chain with 22 branches - have already ripped through their daily delivery of fruit and veg.
Rewind a decade and the Chinn family was quietly growing spuds in the Wye Valley, a crop they had farmed for four generations.
Farmer, chef and restaurateur - three brothers with the perfect mix of skills to succeed in the restaurant business.
At this time of year, the shocking pink stems of forced rhubarb are by far the most dazzling crop on the Market.