In a large mixing bowl, whisk together the olive oil, apple cider vinegar, maple syrup, Dijon mustard, fresh lemon juice, salt, and black pepper until smooth and well emulsified.
3 tbsp olive oil, 2 tbsp apple cider vinegar, 1 tbsp maple syrup, 1 tsp Dijon mustard, 1 tbsp lemon juice, ¼ tsp salt, ⅛ tsp black pepper
To the same bowl with the dressing, add the shredded red cabbage, sliced apple, grated carrot, toasted walnuts, fresh parsley, and green onions.
4 cups red cabbage, finely shredded, 1 medium apple, thinly sliced or julienned, 1 medium carrot, grated, ½ cup walnuts, toasted and roughly chopped, ¼ cup fresh parsley, chopped, 2 green onions, thinly sliced
Toss everything together until the cabbage and apples are evenly coated in the dressing. Taste and adjust seasoning with a pinch more salt or black pepper if needed, then serve fresh.