In a small bowl, whisk together olive oil, apple cider vinegar, honey or maple syrup, Dijon mustard, salt, and pepper until well emulsified. Set aside.
In a large salad bowl, add the fresh baby spinach as the base.
Layer the sliced strawberries, cucumber, and red onion over the spinach.
Sprinkle the crumbled feta cheese and toasted nuts on top for added texture and flavor.
Drizzle the poppy seed dressing over the salad just before serving, tossing gently to combine the ingredients.
Adjust the seasoning if needed, adding more salt or pepper to taste.
Notes
Serve the salad in a large bowl for a family-style presentation or in individual plates. Garnish with extra poppy seeds and a few whole strawberries for an appealing look.