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. Cut the citrus into thin rounds or release individual segments by slicing along the membrane walls. Set aside.
02 - Halve the avocado, remove the pit, and peel the skin. Slice the flesh into thin, even wedges and set aside.
03 - Peel the red onion and cut it into paper-thin slices using a sharp knife or mandoline.
04 - In a small mixing bowl, combine the extra-virgin olive oil, fresh lemon juice, honey or maple syrup, and Dijon mustard. Whisk vigorously until emulsified. Season with sea salt and freshly ground black pepper to taste.
05 - Spread the mixed greens evenly across a large serving platter, creating a lush base layer.
06 - Arrange the citrus rounds and segments over the greens. Distribute the avocado slices and red onion rings across the platter in an even, visually appealing pattern.
07 - Scatter the pomegranate seeds and crumbled feta cheese generously over the assembled salad.
08 - Drizzle the prepared dressing evenly over the entire platter. If desired, finish with torn fresh mint leaves and chopped toasted pistachios or walnuts. Serve immediately.