01 - In a dry skillet over medium heat, toast pecan halves for 3–4 minutes, stirring frequently until fragrant. Remove from heat and let cool.
02 - In a small bowl, whisk together olive oil, balsamic vinegar, honey, Dijon mustard, salt, and pepper until well combined.
03 - In a large salad bowl, combine spinach, sliced strawberries, and red onion.
04 - Drizzle half the vinaigrette over the salad and toss gently to combine.
05 - Add toasted pecans and crumbled feta cheese (if using). Drizzle remaining vinaigrette. Toss lightly just before serving.