Add the quinoa and 1 teaspoon of salt. Lower the heat and simmer with a cover for 15 minutes. (Cooked quinoa should look like this.)
Drain, place in a bowl. Immediately add the lemon juice, oil and 1 to 1 1/2 teaspoons of salt.
In a large bowl, combine the scallions, mint, parsley, cucumber, tomatoes, 1 to 2 teaspoons of salt and 1 teaspoon of pepper.
Add the quinoa. Mix everything together well.
Carefully fold in the feta.
Taste and adjust for seasonings.
This dish is very versatile as it can be served either at room temperature or cold. Having the dish sit at room temperature for a few hours can actually help the flavours and vinaigrette soak into the quinoa and make it even more delicious!