Yellow-leek field in San Wai Tsai in Tai Po. Young yellow-leeks are covered by clay utensils separately to screen out the sunlight and stay yellow in colour.大埔新圍仔的韮黃田，葉株幼嫩時套入陶製圓筒中生長以阻隔陽光，以保存原來菜葉的黃色。