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Ingredients

• 1 recipe  Horseradish Sauce (see recipe below)
• 1-1/2 teaspoons  dried oregano, crushed
• 1-1/2 teaspoons  coriander seed, crushed
• 1 teaspoon  salt
• 1 teaspoon  freshly ground black pepper
• 2 tablespoons  butter
• 2 large  sweet onions, such as Texas 1015 or Vidalia, cut into 1/4-inch-thick slices (about 4 cups)
• 2 cloves  garlic, minced
• 1-1/2 pounds  beef flank steak or boneless beef top sirloin steak, cut 1 inch thick
• 6 small  romaine lettuce leaves
• 6   purchased bakery sourdough rolls or 12 slices sourdough bread, toasted

Description

Flank Steak, Sweet Onions, And A Spicy Sauce Turn These Sandwiches Into A Satisfying Meal.

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