Ingredients

• 1 tablespoon Dijon mustard
• 2 tablespoons cider vinegar
• 1/2 cup mayonnaise
• 2 tablespoons sugar
• 1/2 cup (about a large handful) flat-leaf parsley, chopped
• 2 cloves garlic, finely chopped or grated
• Salt and ground black pepper
• 1/2 large head red cabbage, thinly sliced
• 1 green bell pepper, seeded and thinly sliced
• 1 red bell pepper, seeded and thinly sliced
• 3 stalks celery from the heart, thinly sliced on a bias
• 4 scallions, thinly sliced on a bias