01 - Place the sliced apples in a bowl and toss with lemon juice to prevent browning.
02 - In a dry skillet over medium heat, toast walnuts for 3–5 minutes, stirring frequently until fragrant and lightly browned. Set aside to cool.
03 - In a small bowl, whisk together olive oil, apple cider vinegar, Dijon mustard, honey, salt, and pepper until emulsified.
04 - In a large mixing bowl, combine apples, celery, minced shallot, and toasted walnuts.
05 - Pour the dressing over the salad and toss gently to coat all ingredients evenly.
06 - Transfer to a serving platter and garnish with chopped parsley, if desired. Serve immediately.