Make salad dressing by combining the first 7 ingredients in medium to large bowl. Place the carrots in a pot and cover with cold water. Gently boil carrots and until just tender, but still firmly holding their shape, about 2 to 3 minutes. Drain carrots well, cool in ice-cold water, and then drain well again. Add the carrots to the salad dressing, along with the feta, onion and mint. Toss all to combine and serve.