Add the quinoa in a sieve and rinse under the faucet. Over medium heat, in a cooking pot, boil the water and the quinoa. When it boils, simmer on low for about 15 minutes or until the water is completely absorbed. Transfer to a bowl and let it cool down.
While waiting for the quinoa to cook, grill the vegetables in a dry griddle. When they are cooked through, dice them. Over a small pot of boiling water, cook the peas for 3 minutes then transfer them to a bowl of ice water. When they have cooled down, drain.
Toss the cooked quinoa, vegetables, parsley, extra virgin olive oil, balsamic vinegar, salt and pepper.