re: Steak Sandwich Recipe?

I've made this one a few times and people seem to really enjoy it
Marinade
1/4 cup balsamic vinegar
1/4 cup soy sauce
1/4 cup Worcestershire sauce
1 tablespoon yellow mustard seeds, cracked

3 (12 to 14-ounce) rib-eye steaks
4 ounces Gorgonzola, crumbled
1/2 cup sour cream
Salt and freshly ground black pepper
1 baguette (about 2 feet long), split lengthwise
2 cups lightly packed arugula

Mix the sour cream and gorgonzola together to form a spread.
Put the spread onto the baguette
Cut steak into slices and season with salt and pepper and place onto baquette.
Top with arugula