Combine the salad base: in a large mixing bowl, add the pre-washed lettuce, shredded red cabbage, shredded cooked chicken, diced red pepper, sliced scallions, drained mandarin oranges, and chow mein noodles.
Make the dressing: in a small bowl, whisk together minced garlic, grated ginger, brown sugar, sesame oil, soy sauce, white vinegar, and canola oil until smooth and the sugar dissolves.
Toss and serve: pour the dressing over the salad and toss gently until everything is evenly coated; serve immediately.
Adjust to taste: taste the dressing and adjust sweetness or acidity as desired by adding more brown sugar or vinegar.