Blanch the Napa cabbage leaves in hot water for 30 to 40 seconds until just softened. Remove, pat completely dry, and set aside.
In a bowl, mix together the minced chicken, ginger, garlic, spring onions, carrots, soy sauce, oyster sauce, sesame oil, white pepper, cornstarch, and salt.
Place 2 to 3 tablespoons of filling onto each cabbage leaf and roll gently, keeping the seam side down.
Heat a pan with 1 to 2 teaspoons of oil and lightly sear the rolls until golden. Add ½ cup hot water, cover, and steam for 4 to 5 minutes, or until the chicken is fully cooked.
Mix together the soy sauce, vinegar, water, sesame oil, and sugar for the sauce. Pour over the rolls and finish with chili oil and sesame seeds.
