Heat broiler. Season the steak with 1/2 teaspoon salt and 1/2 teaspoon pepper. Line a rimmed baking sheet with foil. Place the steak on one half of the baking sheet.
Toss the tomatoes and onion in a medium bowl with the olive oil, balsamic vinegar, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Place the onion and tomatoes, cut-side down, on the other half of the baking sheet.
Broil the steak and vegetables, turning everything once, until the steak reaches the desired doneness, 4 minutes per side for medium rare. Remove the steak and return the vegetables to oven until browned, about 1 minute more.
Slice the steak. Place the bottom halves of the bread cut-side up and top with the steak, onions, tomatoes, and cheese. Sandwich with the remaining bread. Serve warm.
Tips: If blue cheese is too strong for your taste, try topping this sandwich with a creamy goat cheese. Or play off the tartness of the balsamic vinegar with slivers of salty Parmesan or Manchego.
View line-by-line Nutrition Insights™: Discover which ingredients contribute the calories/sodium/etc.
|Serving Size: 1 Serving (333g)|
|Recipe Makes: 4 Servings|
|Calories from Fat: 67 (29%)|
|Amt Per Serving||% DV|
|Total Fat 7.4g||10 %|
|Saturated Fat 3.9g||19 %|
|Monounsaturated Fat 2.3g|
|Polyunsanturated Fat 0.3g|
|Cholesterol 73mg||22 %|
|Sodium 311.6mg||11 %|
|Potassium 814.1mg||21 %|
|Total Carbohydrate 11.4g||3 %|
|Dietary Fiber 2.2g||9 %|
|Sugars, other 9.2g|
|Protein 30.9g||44 %|
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Disclaimer: Nutrition facts are derived from linked ingredients (shown at left in colored bullets) and may or may not be complete. Always consult a licensed nutritionist or doctor if you have a nutrition-related medical condition.
Calories per serving: 231
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