01 - Rinse pearl barley under cold water. In a medium saucepan, bring 2 1/2 cups water and a pinch of salt to a boil. Add barley, reduce heat to low, cover, and simmer for 25 to 30 minutes until tender. Drain any excess water and set aside to cool to room temperature.
02 - While barley cooks, segment the oranges and grapefruit, collecting any released juices into a bowl.
03 - In a large mixing bowl, stir together the cooled barley, orange zest, and half of the chopped fresh mint leaves.
04 - Divide the barley mixture evenly among four serving bowls. Top each with the prepared citrus segments, pomegranate seeds, and spoonfuls of Greek yogurt.
05 - Drizzle each bowl with honey, then sprinkle with chopped pistachios and remaining fresh mint. Serve immediately.