In a large mixing bowl, combine mixed salad greens, sliced strawberries, orange segments, chopped cucumber, and red onion. Toss gently to distribute colors and textures, then set aside.

In a separate bowl, whisk together olive oil, orange juice, lemon juice, and honey until emulsified. Add salt and pepper to taste.

Drizzle the citrus vinaigrette over the salad mixture just before serving and toss gently until coated.

Crumble feta cheese over the salad and sprinkle with toasted walnuts or pecans before serving.