Behind the scenes at an SFO inflight catering kitchen See how Singapore Airlines tests meals for some of its longest flights

Premium economy meal of five spiced pork, fried rice and vegetables Premium economy meal of five spiced pork, fried rice and vegetables Photo: Chris McGinnis Photo: Chris McGinnis Image 1 of / 44 Caption Close Behind the scenes at an SFO inflight catering kitchen 1 / 44 Back to Gallery

How does an airline feed 250 passengers for 19 hours? How does it keep rice or noodles moist for that long? Serve a perfectly cooked medium rare steak on the plane? Or ensure that food is tasty, beautiful and fresh after making its way halfway around the world from kitchen to truck to plane to airplane seat?

Singapore Airlines invited SFGATE cameras out to its inflight kitchens for a look at how it pulls off this amazing feat for some of the longest flights in the world.

Once a quarter, chefs, airline executives and accountants gather in a nondescript beige building next to a Hampton Inn in Millbrae, California. They are there to view, taste and discuss the meals served on Singapore Airlines long haul flights to Asia.

This ritual has recently taken on added importance as the airline chooses meals for its "ultra long haul" flights. Currently, one of Singapore Air's longest flight runs between San Francisco and Singapore, a 16-17 hour odyssey on an Airbus A350-900.

Singapore Air also recently started flying its longest flight, between New York/Newark and Singapore, which clocks in at about 19 hours. Flights like that require new thinking about inflight dining.

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One new concept for ultra-long flights is something like an all-day-brunch or dine-on-demand plan in business class. This means that passengers don't necessarily have to dine when flight attendants push their carts down the aisles. Instead, they can choose from a wide variety of meals at any time during the very long flight.

For example, when you board SIA's SFO-SIN nonstop at 9:30 am, you can choose to have a dim sum or an omelet for breakfast. Or maybe you flew in from the east coast, and would rather have a steak for your first meal? Or maybe just a nice bowl of warm noodle soup. No problem.

As the flight approaches Singapore for a 6 pm arrival 17 or so hours later, some passengers may want breakfast after sleeping during the latter part of the flight. Others who may have slept earlier may be ready for a smoky barbecue sandwich or a bowl of fresh fruit.

If you know what you want before you go, premium economy and business class passengers can go to Singapore Air's website to "book the cook" and order from a special menu of items specially prepared on the ground and served on the plane when requested. (We checked out a few delicious menu items -- like fried prawns tossed with tangy mayonnaise and topped with candied walnuts-- during our visit- see it in the slideshow above.)

The current lowest fares for January flights on Singapore's two dailies between SFO and Singapore are about: $1,000 in economy, $1,600 in premium economy, and around $4,900 in business class. Singapore competes with United on this nonstop route, so fares rise and fall a lot. Singapore Air also flies from SFO to Singapore via Hong Kong using a Boeing 777.

Be sure to scroll through the slideshow at the top for a look behind the scenes at the inflight kitchen and boardroom as execs and chefs taste meals and make decisions. The story is in the captions! You'll get a preview of what it will be like to dine aboard tone of he world's longest distance and duration flights.

What's the best meal you've had on a long distance flight? Would you rather eat or sleep on a flight to Asia? Tell us in the comments!

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Chris McGinnis is SFGATE's senior travel correspondent. You can reach him via email or follow him on Twitter or Facebook. Don't miss a shred of important travel news by signing up for his FREE biweekly email updates!