INGREDIENTS
8
slices good quality bread (I used thick cut Artisan bread)
Mayonnaise (for spreading)
12 oz
Gruyere cheese (sliced thinly OR grated, at room temperature)
6 oz
White cheddar cheese (sliced thinly OR grated, at room temperature)
4
slices thin Muenster cheese (at room temperature)
2
yellow onions (diced)
1 tsp
fresh thyme (minced)
2 tsp
fresh rosemary (minced, divided)
1 tsp
brown sugar
Salt and pepper (to taste)
3 tbsp
butter (divided)
1 tbsp
olive oil