Even during an unprecedented and ongoing wave of fires, the scene behind the lines can still be as mundane as sorting through lunch supplies.

That was the case Saturday at the small Cal Fire station tucked against Sonoma Valley Regional Park in Glen Ellen.

Outside, acres of blackened hillside and charred trees testified to the devastation left in the wake of the flames that tore through Glen Ellen earlier in the week. Inside, five firefighters between shifts and dressed in blue T-shirts and shorts were sifting through mounds of half-eaten lunches -- setting aside what be saved, from bags of potato chips to sports drinks and bottled water.

It’s a task that needs to be done, said one firefighter. You do what you can, when you can.

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Leaning on a fence nearby, EMT Todd Haroutunian and paramedic Andrew Barkdale were on standby awaiting any call for medical assistance. They were beginning what they expected to be a 24-hour shift.

“It’s been slow, so that’s a good thing,” Haroutunian said.

Another good thing? A large red vehicle parked near the station entrance. But it wasn’t a fire truck.

For the past four days, Andrew and Susie Tryfogle have been serving first responders giant steak burritos from their Tri-Tip Trolley -- a souped-up food truck.

“This is home for us,” said Andrew, whose faux cable car usually is found in places like Larkspur Landing or a Petaluma beer garden. “So many people lost everything. And we’re in a unique position to come out and help.”

There were no complaints from the small crew on hand, waiting for whatever might come next.

“It’s a lot better than the rations,” Haroutunian said.

Dominic Fracassa is a San Francisco Chronicle staff writer. Email: dfracassa@sfchronicle.com Twitter: @dominicfracassa