Ultimate Gourmet Grilled Cheese

A three-cheese grilled sandwich on buttery, mayo-crisped artisan bread, loaded with caramelized herb onions.

⏱️ Prep: 15 min🍳 Cook: 15 min

Ingredients

8 slices		good-quality bread, thick-cut
—		mayonnaise, for spreading
12 oz	340 g	Gruyere cheese, sliced or grated
6 oz	170 g	white cheddar cheese, sliced or grated
4 slices		thin Muenster cheese
2		yellow onions, diced
1 tsp	5 ml	fresh thyme, minced
2 tsp	10 ml	fresh rosemary, minced, divided
1 tsp	5 ml	brown sugar
—		salt and pepper
3 tbsp	45 ml	butter, divided
1 tbsp	15 ml	olive oil

Add 1 1/2 tbsp of the butter and the olive oil to a skillet and heat over medium-low. Add the diced onions, salt, pepper, thyme and 1 tsp of the rosemary and sauté, stirring often, until the onions are soft and starting to brown, about 10 minutes.
Stir the brown sugar into the onions and cook another minute, then transfer the onions to a plate.
Spread one side of two slices of bread with a little mayonnaise.
To the same skillet, add the remaining butter and rosemary and heat over medium heat. Swirl to coat the bottom with the melted butter.
Add both slices of bread, mayonnaise side down, and cook until golden brown and crunchy, about 2–3 minutes.
As soon as you add the bread, put a bit of cheese on top of each slice. Once it starts to melt a little, sprinkle a couple tablespoons of the caramelized onions over one of the slices.
When the bread is golden brown, sandwich the two slices together and cook on low until the cheese is fully melted.
Transfer to a plate and repeat with the remaining bread and ingredients. Slice and enjoy!

Chef tip: If your cheese won't melt smoothly, add all the cheese to a food processor and pulse until it forms a paste, then use as directed.