关于此食谱

富有焦糖化洋葱的汤，顶部配有芝士吐司。

步骤说明

1. 1

   Caramelize the onion in butter over ^[medium heat] for 35-40 minutes.

2. 2

   Add the beef broth and simmer 15 minutes.

3. 3

   Ladle into mixing bowl, top with toast and gruyere cheese, and broiler until bubbly.