Blend together all the dressing ingredients to craft the vinaigrette whisking in the oil in a very slow stream.
Simmer the Israeli couscous in the vegetable stock.
Cover and cook on extremely low indirect heat until stock is absorbed and the couscous is tender; cool on a parchment paper lined tray.
Combine the salad ingredients (reserving the feta) with as much of the dressing as needed to moisten and flavor the couscous.
Chill thoroughly before serving.
Check the seasonings after chilling - Salt and pepper to taste adding more dressing if needed.
Present as a side dish with the feta sprinkled over the top.