01 - Heat a dry skillet over medium heat. Add pecan halves and toast for 3–4 minutes, stirring frequently until fragrant. Remove from heat and let cool completely.
02 - In a large salad bowl, combine the washed and dried baby spinach, sliced strawberries, and thinly sliced red onion.
03 - Sprinkle crumbled feta cheese over the salad if using. Add the cooled toasted pecans.
04 - In a small bowl or jar, whisk together the olive oil, balsamic vinegar, Dijon mustard, and honey. Season with salt and pepper to taste. Whisk vigorously until fully emulsified.
05 - Drizzle the balsamic vinaigrette over the salad just before serving. Toss gently to coat all ingredients evenly. Serve immediately.