GABES, TUNISIA - As soon as the sun is up, people in southern Tunisia rush out to buy a glass or bottle of legmi, a coveted date palm drink that is too delicate to be sold far from the oasis.

At 7:00 am, at the busy Ain Slam roundabout in the center of the coastal city of Gabes, bicycles, cars and military vehicles are clustered around three men seated on plastic chairs.

Next to them are jugs brimming with the precious juice, a testament to the Gabes saying: "Even if the legmi attracts mosquitoes, people will stick around."

Favored particularly during the Muslim holy month of Ramadan for its high sugar content, this drink, typical of Saharan oases, is primarily consumed from March to October.

Many Tunisians enjoy legmi for breakfast, such as Akram, who has walked to the roundabout for the morning rush.

"We were born with legmi," he said.

"My grandfather and my father produced it, my one-and-a-half-year-old daughter has already drunk it, and me, I have even written a song about legmi," said the singer, in his thirties.

Another customer, Haithem, 30, described the drink as "part of our identity".

"It's something rare, it's a gift," he said.

A producer must have an expert hand and not be too greedy to draw the sap from the palm without killing it, he said.

At the Ain Slam roundabout, a 1.5-liter bottle sells for around 2.5 dinars ($0.87).

One of the producers is Ridha Omrane Moussa, who describes himself as the "prince of the palm tree".

Now in his sixties, he has harvested the nectar since learning the technique aged 14 from a relative in the Gabes oasis of Nahal.

"He who doesn't love the palm tree is not Gabesian. After God, there is the palm tree," he said.

Perched atop an eight-meter palm, cigarette between his lips, Moussa had just finished his harvest for the day.

To extract a daily take of 15 liters, he climbs the palms barefoot, using nothing but notches he made in their trunks.

He carefully cuts the bark to cause a reaction from the palm that makes its sap rise.

But "one must not touch the heart of the palm, otherwise it dies," Moussa warned.

He has 25 palm trees but harvests from each for just two and a half years before letting them rest for four years, producing around 8,000 liters annually.

Along with the harvesting, storing the drink is complex as it turns rapidly into vinegar.

To keep it fresh, bottles of ice are placed in the can that the sap flows into overnight, then the juice is immediately frozen until it's poured for sale.

This fragile process limits the consumption of legmi.

"Even in Sfax, there is none," Haithem said, of the coastal city to the north.

"It has stayed organic, without any chemicals or ingredients for preservation, nothing."

Some residents see its fragility and limited reach as a positive.

Haithem said that some were afraid: "If there is a lot of demand, what's going to happen? They're going to cut a lot of palms and risk losing the oases."

Moussa, the legmi producer, warned that "chemical pollution from factories is a threat to the oases."

State-owned Tunisian Chemical Group has been processing phosphate in the area since the 1970s and has been blamed for putting the oases at risk.

But for now, the future of legmi producers is assured.

"I taught my son this work so that this tradition stays in Gabes forever," Moussa said. -AFP