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Grilled Marinated Sirloin Flap Steaks

Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 16 Jan 2026

Meets Patient’s editorial guidelines

This high-protein dish features sirloin flap steaks, a butcher’s cut prized for its deep, beefy flavour and ability to absorb bold seasonings. The marinade balances the salty notes of soy sauce with the sweetness of maple syrup and the tang of balsamic vinegar, creating a rich glaze that caramelises beautifully over direct heat. It is a sophisticated yet simple way to elevate a mid-week meal or a weekend barbecue.

Ideal for those following a nutritious, protein-rich diet, these steaks are best served thinly sliced across the grain to ensure maximum tenderness. Pair the beef with a crisp seasonal salad or roasted Mediterranean vegetables for a balanced dinner. Resting the meat is essential here, as it allows the juices to redistribute, resulting in a perfectly succulent finish every time.

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Ingredients for Grilled Marinated Sirloin Flap Steaks

  • 45ml soy sauce

  • 45ml balsamic vinegar

  • 3 tablespoons pure maple syrup

  • 4 garlic cloves, chopped

  • 900g sirloin flap steaks

How to make Grilled Marinated Sirloin Flap Steaks

Blend soy sauce, vinegar, syrup, garlic, 1/2 teaspoons salt, and 1/2 teaspoons pepper in a blender until smooth. Toss steaks with mixture. Marinate at room temperature about 15 minutes.

Prepare a grill for direct-heat cooking over hot charcoal (high heat for gas); see grilling procedure.

Discard marinade and pat steaks dry.

Oil grill rack, then grill steaks, covered only if using a gas grill, turning occasionally, 6 to 8 minutes total for medium-rare. Let rest on a plate, uncovered, 10 minutes.

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.

  • 16 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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