INGREDIENTS
4
Chicken breasts, boneless skinless
2
Onions
1/2
head Radicchio
1
Recipe caramelized onions
1/2
head Romaine
1/4 cup
Heinz mayonnaise
1
Kosher salt and freshly ground black pepper
2 tbsp
Olive oil
4
Pretzel rolls
2 tbsp
Butter, unsalted
8
slices Swiss cheese