01 - In a large salad bowl, combine the baby spinach, sliced strawberries, toasted walnuts, and red onion.
02 - If using, sprinkle the crumbled feta cheese over the salad.
03 - In a small bowl or jar with a lid, whisk together the olive oil, balsamic vinegar, honey, Dijon mustard, salt, and pepper until well combined and emulsified.
04 - Drizzle the vinaigrette over the salad just before serving. Toss gently to coat all the ingredients evenly.
05 - Serve immediately for the freshest flavor and texture.