Globalseo is still translating this page...
Skip to main content

Sweet Potato Tempura and Steak Sandwich with Bok Choy and Miso Mayo

This steak and sweet potato tempura sandwich is a sophisticated, high-protein take on a classic fusion dish. By replacing traditional bread with crisp, golden planks of sweet potato tempura, you create a satisfying gluten-free base that pairs beautifully with the umami-rich components. The tender skirt steak, marinated in ginger and soy, provides a punchy, savoury depth that is lifted by the fresh crunch of charred bok choy and a luxurious miso-infused mayonnaise.

Perfect for a weekend lunch or an impressive midweek meal, this dish balances textures and temperatures for a truly professional finish. The use of a light tempura batter ensures the sweet potato stays light rather than heavy, while the hit of citrus in the mayo cuts through the richness of the beef. Serve it fresh from the pan to enjoy the contrast between the hot, crunchy tempura and the succulent, rested steak.

Video picks

Continue reading below

Ingredients for Sweet Potato Tempura and Steak Sandwich with Bok Choy and Miso Mayo

  • 2 teaspoons finely grated ginger

  • 1 large clove garlic, finely grated

  • 45ml vegetable oil, divided

  • 2 tablespoons low-sodium soy sauce

  • 1 tablespoon mirin

  • 1/2 teaspoons kosher salt

  • 1/4 teaspoons black pepper

  • 275g skirt steak, cut into 2 pieces

  • 2 heads baby bok choy, split in half lengthwise (230g )

  • 1 large sweet potato

  • Vegetable oil, for frying

  • 120ml plain flour

  • 2 tablespoons cornflour

  • 3/4 teaspoons kosher salt, divided

  • 120ml very cold club soda

  • 1/2 teaspoons white miso paste

  • 60ml mayonnaise

  • 1 teaspoon fresh lemon juice

  • A mandoline

Whisk the ginger, garlic, 1 tablespoon oil, soy sauce, mirin, salt, and pepper in a small bowl. Place the skirt steak in a resealable plastic bag and pour the marinade over. Turn to coat and let sit at room temperature 30 minutes.

Remove the skirt steak from the marinade. Heat 1 tablespoon oil in a large skillet over medium-high heat. Add the steak and sear to desired doneness, about 3 minutes per side for medium rare. Let steak rest on a cutting board.

Wipe out skillet and heat remaining 1 tablespoon oil. Sear the bok choy cut side down over medium-high heat until browned, 2 to 3 minutes. Flip the bok choy over, add 60ml water, cover, and cook 2 minutes more. Remove bok choy and roughly chop.

Using a mandoline, carefully slice the sweet potato lengthwise into 1/8-inch-thick planks. Select 4 planks from the centre of the sweet potato that are similar in size. Meanwhile, fill a large Dutch oven or cast-iron skillet with oil to a depth of 1 1/2 inches and heat carefully to 177°C. Sift the flour, cornflour, and 1/2 teaspoons salt into a large bowl. Gently incorporate the club soda into the flour mixture; do not overmix. Coat 2 slices sweet potato in the batter and fry, turning occasionally, until golden brown, about 5 to 6 minutes. Repeat with remaining 2 slices sweet potato. Sprinkle with remaining 1/4 teaspoons salt and drain on a cooling rack placed over a sheet tray.

Assemble the sandwich: Mix together the miso, mayonnaise, and lemon juice in a small bowl. Thinly slice the skirt steak against the grain. Place 1 fried sweet potato slice on a plate and layer with half the bok choy, half the skirt steak and 1 tablespoon of miso mayo. Top with another sweet potato slice to form a sandwich. Repeat with remaining sweet potato slices to make a second sandwich.

The leftover miso mayo can be refrigerated for up to a week.

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.

  • 28 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
flu eligibility checker

Ask, share, connect.

Browse discussions, ask questions, and share experiences across hundreds of health topics.

symptom checker

Feeling unwell?

Assess your symptoms online for free

Sign up to the Patient newsletter

Your weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.

Please enter a valid email address

By subscribing you accept our Privacy Policy. You can unsubscribe at any time. We never sell your data.