I’m a big fan of My City Helsinki, it is a good place to go for food before your flight. I travel A LOT between Helsinki and NYC, and I always stop by My City Helsinki on my way to my gate for my return flight. I get a fresh salad and a very sizeable pour of wine to make the 8 hour flight a little more comfortable(ie it aides in my sleeping once on board). Grab a snack and a few bottles of wine for the flight to go also.