Teppanyaki Hamburg Steak Sandwiches

Name: Teppanyaki Hamburg Steak Sandwiches
Prep time: 35 min
Cook time: 28 min
Total time: 1 h 3 min
Yield: 4 servings
Cuisine: Japanese
Ingredients: 1 lb (454 g) ground beef (80% lean), cold, straight from the fridge; ½ cup (30 g) panko breadcrumbs; 4 tbsp (60 ml) whole milk; 1 small (about 5 oz) (150 g) yellow onion, peeled and very finely diced (¼-inch / 6 mm or smaller); 1 large (50 g) large egg, lightly beaten; 1 tsp (4 g) kosher salt; ¼ tsp (½ g) black pepper, freshly ground; ⅛ tsp (0.3 g) ground nutmeg; 3 tbsp (45 ml) neutral oil (vegetable or canola), divided: 1 tbsp for the onion, 1 tbsp for searing, 1 tbsp for the eggs if using; ⅓ cup (80 ml) tonkatsu sauce; 2 tbsp (30 g) ketchup; 1 tbsp (15 ml) mirin; 7 tbsp (105 ml) water, divided: ¼ cup (60 ml) for the glaze, 3 tbsp (45 ml) for steaming the patties; 2 cups (140 g) green cabbage, cored and very thinly shredded; 2 tbsp (30 g) Japanese mayonnaise (such as Kewpie); 1 tsp (5 ml) unseasoned rice vinegar; ⅛ tsp (0.7 g) fine salt; 8 slices (360 g) shokupan (Japanese milk bread), ¾-inch / 2 cm thick slices; 2 tbsp (28 g) unsalted butter, softened to room temperature; 2 tbsp (30 g) Japanese mayonnaise (such as Kewpie); 4 large (200 g) large eggs, fried sunny-side up, cracked into small cups (optional)

From the MyKitchenBank Kitchen

Juicy Japanese-style hambagu patties, seared in a hot pan and glazed in a sweet-savory tonkatsu sauce, then stacked on butter-toasted shokupan with crisp cabbage slaw and Japanese mayo. Optional fried eggs make it a diner-style showstopper.

Prep: 35 min
Cook: 28 min
Wait: 30 min
Total: 1 hr 33 min
Makes: 4 sandwiches

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Ingredients

4 servings

For the patties
1 lb (454 g) ground beef (80% lean), cold, straight from the fridge
½ cup (30 g) panko breadcrumbs
4 tbsp (60 ml) whole milk
1 small (about 5 oz) (150 g) yellow onion, peeled and very finely diced (¼-inch / 6 mm or smaller)
1 large (50 g) large egg, lightly beaten
1 tsp (4 g) kosher salt
¼ tsp (0.5 g) black pepper, freshly ground
⅛ tsp (0.3 g) ground nutmeg
3 tbsp (45 ml) neutral oil (vegetable or canola), divided: 1 tbsp for the onion, 1 tbsp for searing, 1 tbsp for the eggs if using
For the glaze
⅓ cup (80 ml) tonkatsu sauce
2 tbsp (30 g) ketchup
1 tbsp (15 ml) mirin
7 tbsp (105 ml) water, divided: ¼ cup (60 ml) for the glaze, 3 tbsp (45 ml) for steaming the patties
For the slaw
2 cups (140 g) green cabbage, cored and very thinly shredded
2 tbsp (30 g) Japanese mayonnaise (such as Kewpie)
1 tsp (5 ml) unseasoned rice vinegar
⅛ tsp (0.7 g) fine salt
To assemble
8 slices (360 g) shokupan (Japanese milk bread), ¾-inch / 2 cm thick slices
2 tbsp (28 g) unsalted butter, softened to room temperature
2 tbsp (30 g) Japanese mayonnaise (such as Kewpie)
4 large (200 g) large eggs, fried sunny-side up, cracked into small cups (optional)

Equipment (7)

12-inch (30 cm) heavy skillet, cast iron or stainless steel, with a lid
Small (8-inch / 20 cm) skillet or the same skillet for cooking the onion
Large mixing bowl
Large tray or plate lined with parchment paper
Instant-read thermometer
Small bowl and whisk
Spatula

Steps

Before you start

Soften the butter for toasting at room temperature for about 1 hour so it spreads easily.
Use ground beef that is about 80% lean; leaner beef makes dry hamburg steak. Keep it in the fridge until you mix.
Slice or buy shokupan about ¾ inch (2 cm) thick so it holds up to the juicy patty and sauce.
Read the timing: the patties need a 20-minute chill, which you can use to make the slaw and sauce.
Hamburg steak must reach 160°F (71°C) inside, so have an instant-read thermometer ready.

1
Cook the onion
- Heat 1 tbsp (15 ml) of the neutral oil in an 8-inch (20 cm) skillet over medium heat.
- Add the finely diced onion and a pinch of the kosher salt from the patty amount.
- Cook, stirring often, for 5 minutes until soft, translucent and just starting to turn pale gold.
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Ready when: Onion is soft and translucent with no raw crunch, with only light golden edges.
Tip: Do not brown it deeply; dark onion adds bitterness and makes the patty taste different from classic hambagu.
2
Cool onion, soak panko
- Scrape the onion into a large mixing bowl and spread it out.
- In a small bowl, stir the panko into the milk and let it sit.
- Let both stand for 10 minutes until the onion is cool to the touch and the panko has absorbed the milk into a thick paste.
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Ready when: Onion no longer feels warm; panko has absorbed all the milk and looks like damp paste.
Tip: Hot onion will start melting the beef fat and make the patties greasy and crumbly.
3
Mix the meat
- Add the cold ground beef, soaked panko, beaten egg, the remaining kosher salt (about 1 tsp total), pepper and nutmeg to the onion.
- Mix with your hand in one direction for about 1 minute, just until the mixture looks sticky and uniform.
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Ready when: Mixture is tacky and holds together when squeezed, with no streaks of egg or dry panko.
Tip: Stop as soon as it is combined; overmixing makes the patties dense and rubbery.
4
Shape and chill
- Divide the mixture into 4 equal portions of about 5½ oz (155 g) each.
- Toss each portion from hand to hand 5 or 6 times to knock out air pockets, then shape into an oval or round about 4½ inches (11 cm) wide and ¾ inch (2 cm) thick.
- Press a shallow dimple in the center of each with your thumb.
- Place on a parchment-lined tray and refrigerate for 20 minutes.
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Ready when: Patties feel firm and cold to the touch.
Tip: The dimple prevents the center from puffing into a dome as the patty cooks.
5
Make slaw and glaze
- While the patties chill, toss the shredded cabbage with 2 tbsp (30 g) Japanese mayo, the rice vinegar and the fine salt; refrigerate.
- In a small bowl, whisk the tonkatsu sauce, ketchup, mirin and ¼ cup (60 ml) of the water until smooth.
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Ready when: Slaw is lightly coated, not soupy; glaze is smooth with no ketchup streaks.
Tip: Keep the remaining 3 tbsp (45 ml) of water separate; it is for steaming the patties later.
6
Toast the shokupan
- Spread the softened butter on one side of each of the 8 slices.
- Heat the 12-inch (30 cm) skillet over medium heat for 1 minute.
- Toast the bread buttered side down in batches for 2 to 3 minutes per batch until evenly golden.
- Move to a plate, toasted side up.
- Wipe the pan clean.
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Ready when: Bread is an even golden brown with a crisp surface and soft interior.
Tip: Shokupan is sweet and browns quickly, so watch it closely and lower the heat if it darkens in under 2 minutes.
7
Sear the patties
- Heat 1 tbsp (15 ml) oil in the 12-inch skillet over medium-high heat for 1 to 2 minutes until it shimmers.
- Add the patties, dimple side up, with space between them.
- Sear without moving for 3 minutes, then flip and sear the second side for 2 minutes.
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Ready when: Both sides are deep brown and the patties release easily from the pan.
Tip: If a patty sticks, give it another 20 seconds; it releases when the crust has formed.
8
Steam through
- Reduce the heat to medium-low.
- Pour the 3 tbsp (45 ml) extra water into the pan away from the patties and cover immediately with the lid.
- Cook for 6 minutes.
- Insert an instant-read thermometer into the thickest part of a patty.
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Ready when: Thermometer reads 160°F (71°C) and juices run clear.
Tip: If the center is not at 160°F (71°C), cover and cook 1 to 2 minutes more and check again.
9
Glaze the patties
- Remove the lid, raise the heat to medium, and pour the glaze around the patties.
- Simmer for 2 minutes, spooning the sauce over the patties and turning once, until the sauce is syrupy and clings to the meat.
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Ready when: Sauce is glossy and thick enough to leave a trail when you drag a spatula through the pan.
Tip: Pull the pan off the heat if the sauce starts to scorch; it thickens fast.
10
Fry the eggs
- If using eggs, heat 1 tbsp (15 ml) oil in a separate small skillet over medium heat.
- Fry the 4 eggs for 2 to 3 minutes until the whites are fully set and the edges are lacy but the yolks are still jammy.
- Skip this step for plain sandwiches.
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Ready when: Whites are opaque and set with no clear jelly; yolks are still glossy.
Tip: Cook the yolks through if serving to young children, pregnant guests or anyone with a weakened immune system.
11
Assemble and serve
- Spread the remaining 2 tbsp (30 g) mayo on the untoasted side of 4 bread slices.
- Top each with a glazed patty, a spoonful of extra pan sauce, a fried egg if using, and a generous pile of slaw.
- Close with the remaining toast, toasted side out.
- Cut in half and serve right away.
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Tip: Serve immediately; the soft bread absorbs the sauce quickly.

Good to know

Tips

Cool the cooked onion fully before mixing; warm onion makes the patties greasy and crumbly.
Mix just until sticky and combined for a tender, juicy patty rather than a dense one.
Steaming with a splash of water and a lid cooks the thick patties through without burning the crust.
Add a squeeze of lemon or a dab of karashi (Japanese mustard) to the mayo spread for extra bite.

Make ahead

Shape the patties up to 1 day ahead, cover and refrigerate on the parchment-lined tray. Make the glaze up to 3 days ahead. Shred the cabbage up to 1 day ahead, but dress the slaw just before serving for the best crunch.

Storage & reheating

Assembled sandwiches do not store well. Store cooked patties with their sauce in an airtight container: room temperature up to 1 hour, fridge up to 3 days, freezer up to 2 months (thaw overnight in the fridge). Reheat patties in a covered skillet over medium-low heat with a splash of water for 5 to 6 minutes until steaming hot and 165°F (74°C) inside. Keep slaw and bread separate and refrigerate the slaw up to 1 day.

Substitutions

shokupan (Japanese milk bread), ¾-inch / 2 cm thick slices → thick-cut white sandwich bread or brioche slices. Toast a little longer, 3 to 4 minutes per side, since they are less sweet and slightly drier.
tonkatsu sauce → 3 tbsp Worcestershire sauce plus 3 tbsp ketchup plus 1 tsp soy sauce plus 1 tsp sugar. Makes a similar tangy-sweet glaze; use it in place of the tonkatsu sauce and ketchup together.
ground beef (80% lean) → half ground beef and half ground pork. This is the traditional hambagu mix and makes a slightly softer, juicier patty. Same weight, same 160°F (71°C) doneness.
Japanese mayonnaise (such as Kewpie) → regular mayonnaise with a pinch of sugar. Japanese mayo is richer and tangier; add ½ tsp extra rice vinegar to match.