Grilled Portobello, Blue Cheese and Caramelized Onion Hoagie

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Mushrooms:

1/4 cup extra-virgin olive oil

1 tablespoon Worcestershire sauce 

1/2 teaspoon kosher salt 

1/4 teaspoon freshly ground black pepper 

1/4 teaspoon garlic powder 

Juice of 1/2 lemon 

4 portobello mushrooms, sliced 1/4 inch thick 

Onions:

2 tablespoons olive oil

2 yellow onions, halved and thinly sliced 

Kosher salt and freshly ground black pepper

Blue Cheese Spread: 

4 ounces blue cheese, crumbled 

1/3 cup mayonnaise 

Sandwiches:

4 hoagie rolls (I like Martin's), split

1 cup arugula 

Balsamic vinegar, for drizzling 

Kosher salt