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Top Sirloin Steak with pepper and Onion Sauté

This pan-seared sirloin steak with pepper and onion sauté is a vibrant and nutritious choice for a satisfying midweek dinner. By marinating the beef in a punchy garlic and balsamic mixture, you ensure every bite is deeply savoury and tender. The colourful combination of red and green peppers brings a natural sweetness that pairs perfectly with the rich, melted blue cheese garnish, creating a restaurant-quality meal that remains heart-healthy.

As a diabetes-friendly main course, this dish focuses on lean protein and high-fibre vegetables rather than heavy carbohydrates. It is a wonderfully versatile recipe that can be prepared in advance, making it ideal for hosting or a busy evening. Serve the sliced steak with a fresh green salad or some steamed seasonal greens for a light yet comforting meal that feels truly indulgent.

Continue reading below

Ingredients for Top Sirloin Steak with pepper and Onion Sauté

  • 2 675g top sirloin steaks (or one 2- to 1.4kg steak), 1 inch thick

  • 90ml olive oil

  • 2 tablespoons balsamic vinegar or red wine vinegar

  • 6 garlic cloves, minced

  • 1 large onion, sliced

  • 1 large red pepper, sliced

  • 1 large green pepper, sliced

  • 240ml unsalted beef broth or low-salt chicken broth

  • Crumbled Gorgonzola or other blue cheese

  • Minced fresh Italian parsley

How to make Top Sirloin Steak with pepper and Onion Sauté

Place steaks in glass baking dish. Mix 4 tablespoons oil, vinegar and half of garlic in small bowl. Pour over steaks; turn to coat. Marinate 30 minutes at room temperature or refrigerate 3 hours.

Heat 2 tablespoons oil in heavy large skillet over medium heat. Add onion, peppers and remaining garlic and sauté 8 minutes. Add broth, increase heat and boil until vegetables are tender and liquid thickens slightly, about 5 minutes. Season with salt and pepper. (Can be prepared 3 hours ahead. Cover and chill.)

Prepare barbeque (high heat) or preheat grill. Remove steaks from marinade. Sprinkle with salt and generous amount of pepper. Grill steaks until cooked as desired, about 5 minutes per side for rare. Transfer steaks to platter and let stand 5 minutes. Bring vegetables to simmer. Slice steaks; arrange on platter. Top with vegetables and skillet juices. Sprinkle with cheese and parsley.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 17 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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