Cook quinoa and couscous according to the package directions for each (I love making quinoa in a pressure cooker if you have one- fast and moist and delicious!) 1/4 cups raw quinoa makes 1 cup. 1/2 cup raw couscous makes 1 cup.
Thaw corn, chop onions, dice avocado, slice tomatoes in half, peel and dice carrot.
Mix together all ingredients, except olive oil and lemon. Finally, toss together with olive oil and a spritz or two of fresh lemon juice.