01 - In a small bowl or jar, whisk together the extra-virgin olive oil, apple cider vinegar, honey, Dijon mustard, and poppy seeds. Season with salt and pepper. Whisk vigorously until the mixture is fully emulsified, then set aside.
02 - Place the baby spinach, sliced strawberries, crumbled feta cheese, toasted nuts, and red onion into a large salad bowl.
03 - Drizzle the poppy seed vinaigrette over the salad ingredients just before serving. Toss the salad gently to ensure the leaves and fruit are evenly coated without bruising them.
04 - Transfer the salad to serving plates and serve immediately while the nuts remain crunchy and the spinach is crisp.