Lemon Barley Soup

Ingredients

• Extra-virgin olive oil
• 1 yellow onion, finely diced
• 1 garlic clove, finely chopped
• 2 celery stalks, thinly sliced
• 1 cup chopped fresh parsley, leaves and stalks
• Salt
• pepper
• 1 cup pearl barley, rinsed
• 6 cups vegetable stock
• 3 to 4 tablespoons lemon juice (from 1 large lemon), plus extra wedges to serve
• 1 or 2 handfuls of greens, chopped
• Greek yogurt, coconut yogurt or crème fraîche, to serve