大啡菇漢堡/蘑菇湯

大啡菇漢堡 免治牛肉400克左右， 中型洋蔥半個,去皮,切粒，麵包50克，牛奶100毫升，大雞蛋1隻，鹽1湯匙，糖1/2湯匙，黑椒粉1茶匙，3湯匙麵粉 汁料：牛油2湯匙，300ml牛清湯，老抽1茶匙，粟粉水2湯匙 蘑菇湯 蘑菇300克，牛油2湯匙，蒜蓉1湯匙，紅蔥頭1粒，雞湯300毫（有鹹味），淡忌廉100毫升 Portobello Mushroom Burger 400 grams of minced beef, half medium onions, peeled and diced, 50 grams of bread, 100 ml of milk, 1 large egg, 1 tablespoon of salt, 1/2 tablespoon of sugar, 1 teaspoon of black pepper powder, 3 tablespoons of flour Sauce: 2 tablespoons of butter, 300ml of beef clear soup, 1 teaspoon of soy sauce, 2 tablespoons of corn starch mushroom soup 300 grams of mushrooms, 2 tablespoons of butter, 1 tablespoon of garlic, 1 slice of shallot, 300 ml of chicken soup (salty), 100 ml of light cream