Combine barley and broth in a large saucepan. Set pan over high heat and bring to a boil. Reduce heat to low, cover and cook 45 minutes until barley is tender.
Drain any excess water and transfer barley to a large bowl. Add lemon juice, olive oil and oregano and toss to combine. Add vegetables and parsley; toss again. Season to taste with salt and pepper. Serve warm or chilled