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2 to 3 large Oso Sweet® onions, peeled and sliced
2 tablespoons olive or vegetable oil
2 teaspoons salt
1 1/2 teaspoons cumin
3/4 teaspoon garlic powder
3/4 teaspoon onion powder
1/2 teaspoon cayenne pepper
1/2 teaspoon coriander seed, crushed
1/4 teaspoon freshly ground black pepper
2 pounds beef flank steak
Juice of 1 lime
1 package hoagie rolls (6 to 8 rolls)

Lime-Cilantro Dressing (see recipe below)

Preheat the outdoor grill. In a large skillet, sauté onions in oil over medium heat until caramel colored, stirring occasionally. Remove them from heat and keep warm.

In a small bowl, stir together the seasonings. Rub the mixture on both sides of the flank steak and grill the steak to desired degree of
doneness. Transfer to a cutting board and squeeze the juice of 1 lime over steak. Slice thinly at an angle.

To serve, split the rolls in half lengthwise. Top with slices of flank steak and caramelized onions. If desired, drizzle the rolls with Lime-Cilantro Dressing before adding the meat.

Recipe makes 6 to 8 sandwiches.

Lime-Cilantro Dressing

2 1/2 tablespoons freshly squeezed lime juice
1 1/4 teaspoon Dijon mustard
1/8 teaspoon sugar
Coarse salt, to taste
Freshly ground black pepper, to taste
1/2 cup vegetable oil
2 tablespoons chopped fresh cilantro

Whisk all ingredients in a small bowl until the mixture is emulsified, and drizzle on flank steak sandwiches.