Assembly
Step 1
In a large, heavy pot, heat butter and oil over medium. Once butter has melted, add onions and a heavy pinch of salt, stirring to coat onions in oil. Let cook uncovered, not stirring too much at first to let the onions cook down.
Step 2
Once onions start to turn golden, stir every 5-10 minutes. Reduce to medium-low heat, if needed. If higher heat preferred to speed up process, make sure to stir more frequently. It will take about an hour for the onions to fully caramelize.
Step 3
When the onions are a dark brown, but not burnt, add water, Shio Ramen Broth Concentrate, bay leaf, thyme, and rice. Cover, bring to a boil, then reduce to simmer.
Step 4
Let simmer, partially covered over medium heat until thickened and rice has broken down. You can add more or less water, depending on preferred thickness.
Step 5
Right before serving, heat up the Chinese doughnuts, grate gruyère cheese on top, then either broil or torch to melt. Serve with congee.