Ingredients
Equipment
Method
Instructions
- Melt 1 tablespoon of butter in a skillet over medium heat. Add the sliced onions and cook for 20-30 minutes until caramelized.
- Stir in fresh thyme and season with salt and black pepper. Mix well and set aside.
- Butter one side of each slice of sourdough. On the unbuttered side, layer half of the grated Gruyère, then the caramelized onions, then the remaining Gruyère. Close with another slice of bread, buttered side facing out.
- Heat a skillet or griddle over medium heat. Grill each side for 4-5 minutes until golden brown and crispy.
- Remove from the skillet, let cool for a minute, then slice diagonally and serve warm.
Nutrition
Notes
For best results, stir onions infrequently while caramelizing. Store leftovers in the fridge for up to 2 days or freeze for 2 months.
