Caramelize Onions

1. Melt Butter: In a large pot, melt 4 tablespoons of butter over medium heat.
2. Cook Onions: Add the sliced onions and sugar, stirring to coat well. Cook for about 35 minutes, stirring occasionally until they are golden brown.
3. Season: Season with a pinch of salt and transfer the caramelized onions to a bowl.

Make Dipping Broth

4. Melt Butter: In the same pot, melt 2 tablespoons of butter.
5. Make Roux: Whisk in the flour until it forms a smooth paste.
6. Add Liquids and Seasoning: Add thyme, white cooking wine (or vegetable broth), beef or vegetable broth, and pepper. Stir well.
7. Thicken: Heat for 3-5 minutes until the broth is slightly thickened. Pour into a bowl and set aside.

Assemble Grilled Cheese

8. Prepare Bread: Butter one side of each slice of bread.
9. Toast Bread: In a pan over medium heat, place the slices butter-side down. Once toasted, flip them.
10. Add Fillings: On one slice, add a generous amount of cheese and caramelized onions, then top with another slice of bread.
11. Cook: Cook until the cheese melts and both sides are golden brown.

Serve

12. Slice and Serve: Slice the grilled cheese and serve it alongside a bowl of the dipping broth. Enjoy!