准备

• In a large, heavy skillet over medium heat, melt the butter. Add the onion and 1/2 tsp. salt, stir to coat, cover, and reduce the heat to medium low. Cook for 10 minutes, stirring once or twice, using the onions to sweep the pan as you stir.
• Uncover the pan, add the broth and thyme, and cook, stirring occasionally, until the onions are very soft and the liquid has evaporated, about 15 minutes. Add the sherry, increase the heat to high, and stir until the alcohol cooks off, about 30 seconds. Season to taste with salt.
• 用油刷四片面包。将油面放在大烤盘上。将四分之三的奶酪划分为面包片。将洋葱划分为奶酪，然后撒上剩余的奶酪。用剩余的面包在三明治上放上三明治，然后用油刷顶。
• 用中火加热烤架。重量三明治（烤盘上放着一些重罐子很好），然后煮至底部深金色，奶酪融化为融化，大约4分钟。翻转三明治并煮熟，根据需要将三明治移动到烤架周围均匀褐色，直到第二侧变成金色，再增加2分钟。将三明治切成两半，然后食用。