A bright and refreshing salad brings together sweet mandarin oranges and salty feta cheese over a bed of fresh spinach. The combination of juicy citrus and briny black olives creates a bold flavor profile inspired by coastal cooking. Crisp red onion rings add a sharp bite that balances the rich cheese. A simple dressing of extra virgin olive oil and fresh lemon juice ties everything together with a light, acidic finish. Serve it as a quick lunch or a colorful side dish for grilled chicken or fish.