01 - Using a sharp knife, slice off the tops and bottoms 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 segments, collecting any juices.
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.
04 - In a small mixing 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 evenly across a large serving platter, creating a lush foundation.
06 - Arrange the citrus segments and avocado slices over the greens. Scatter the thinly sliced red onion on top.
07 - Sprinkle the pomegranate seeds and crumbled feta cheese evenly over the salad.
08 - Drizzle the dressing evenly over the entire salad. Garnish with torn fresh mint leaves and chopped toasted pistachios or walnuts. Serve immediately.