Cook quinoa according to package directions. I like to cook mine in my instant pot. I put 1 cup of dry quinoa and 1 cup of water in the instant pot, set to high pressure for 1 minute and then let it naturally release the pressure for 10 minutes. It comes out perfect every time!
In a large mixing bowl, mix all vegetables together, except the tomato.
In a small bowl, whisk together all the dressing ingredients.
Pour dressing over the vegetables and refrigerate for at least 45 minutes or up to a few hours to allow the flavors to develop.
When ready to serve mix together the vegetables, cooked quinoa, tomatoes and feta cheese and serve.
I like to serve this with a side of hummus and pita. For a complete meal you could also serve some grilled chicken on the side.