01 - Using a sharp knife, slice off the top and bottom of each orange and grapefruit. Following the curve of the fruit, cut away the peel and white pith. Slice the citrus into thin rounds or cut into segments by slicing along the membrane walls.
02 - Halve the avocado, remove the pit, and peel away the skin. Slice the flesh thinly and set aside.
03 - Peel the red onion and cut it into thin, even slices. Separate the rings and set aside.
04 - In a small bowl, whisk together the extra-virgin olive oil, fresh lemon juice, honey or maple syrup, and Dijon mustard until emulsified. Season with sea salt and freshly ground black pepper to taste.
05 - Spread the mixed greens across a large serving platter, creating an even bed for layering.
06 - Arrange the citrus rounds, avocado slices, and red onion rings over the greens in an alternating pattern. Scatter the pomegranate seeds and crumbled feta evenly across the top.
07 - Drizzle the dressing evenly over the entire salad. If desired, garnish with torn fresh mint leaves and chopped toasted pistachios or walnuts. Serve immediately.