Pour 2 cups of water into a medium saucepan and bring to a boil. Add the quinoa and 1 teaspoon of salt, lower the heat, and simmer covered for 15 minutes, until the grains are tender and open (they¿ll have little curly tails). Drain, place in a bowl, and immediately add the lemon juice, olive oil, and 1 1/2 teaspoons of salt.
In a large bowl, combine the scallions, mint, parsley, cucumber, tomatoes, 2 teaspoons salt, and 1 teaspoon pepper. Add the quinoa and mix well. Carefully fold in the feta and taste for seasonings. Serve at room temperature or refrigerate and serve cold.
"Make It Ahead" by Ina Garten (c) Clarkson Potter 2014. Provided courtesy of Ina Garten. All rights reserved.