4 romaine lettuce leaves
4 seeded buns, split
1/4 lb. (125 g) Monterey Jack cheese, sliced
Kosher salt and freshly ground pepper
1 1/2 lb. (750 g) ground chicken, preferably dark meat
1/4 tsp. freshly ground pepper
3/4 tsp. kosher salt
1/2 tsp. chopped fresh thyme
1/2 lb. (250 g) white or brown mushrooms, sliced 1/4 inch (6 mm) thick
1 tsp. unsalted butter
2 tsp. olive oil
Pinch of cayenne pepper
1/2 tsp. freshly ground black pepper
1/2 tsp. kosher salt
1 1/2 tsp. molasses
2 tsp. balsamic vinegar
2 tsp. Dijon mustard
1 cup (8 oz./250 g) ketchup
1/2 cup (4 fl. oz./125 ml) bourbon
2 garlic cloves, minced
1/4 cup (1 1/2 oz./45 g) finely chopped yellow onion
1 tsp. olive oil