Sauce : 50g Butter, 2 tbsps Flour, 2 cups Milk, 75g Button mushroom(sliced), Salt(to taste), Black pepper(to taste).

• 酱汁：牛油50克、面粉2汤匙、奶2杯、磨菇(切片)75克、盐适量、黑胡椒碎适量。