El Palenque is a great, out-of-the-way restaurant if you want something other than standard or chain fast food. They offer Salvadorian fare (a rarity in Portland) and the Mexican dishes are delicious. The salsa is first-rate. Probably the best part about El Palenque is the great service you'll get. It's family-owned and the owner/manager/waiter/busboy is super nice and always willing to tell you something about the food or culture of his country.
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