Cook the quinoa according to the package's directions. Once it is cooked, add the garlic, give it a fluff with a fork and set it aside to cool to room temperature.
In a large bowl, add the scallions, strawberries, cucumbers, mint, parsley, olive oil, vinegar, lemon zest and juice, salt and pepper. Add the cooled quinoa and gently mix all ingredients to combine. If you like, sprinkle each serving with crumbled feta before serving.