Place barley in a small sauce pot, fill with 2 cups of water and bring to a boil. Once boiling, reduce to a simmer and cook covered for about 25 minutes until the water is absorbed. Stir and set aside to cool.
Combine all the ingredients for the dressing in a food processor, process until smooth and set aside.
Transfer the cooled barley to a large bowl, add the remaining salad ingredients and toss to combine.
Add the dressing to the salad, stir gently to combine, season with more salt & pepper if needed and serve.
Notes
Adding cooked shredded chicken to this salad makes a great meal! Slightly adapted from The Kitchn.