Pull a tab, peel back some plastic, and the seaweed wrapped around a triangle of rice is still crisp, like it was never touched. That's the trick behind samgak kimbap, or triangle kimbap — a Korean convenience-store staple built around a wrapper designed to keep everything fresh until the moment you eat it. It was introduced from Japan in the 1990s and, after some early stumbles with pricing and fillings, became a steady seller by the early 2000s.
Triangle kimbap isn't quite the same as rolled kimbap (gimbap): instead of rolling everything in a sheet of seaweed, the filling is stuffed inside the rice before it's pressed into a triangle, and the seaweed goes around the outside afterward. It's also distinct from jumeokbap — the same rice shape without the full seaweed wrap gets that name instead.
Spicy tuna mayo with fresh perilla leaves, pressed into a triangle and wrapped in crisp seaweed.
Prep 15 min
Cuisine Korean
Yield
2 pieces
Ingredients
Instructions
Combine the tuna, mayonnaise, hot pepper paste, chopped perilla leaves, and onion in a bowl. Mix well.
Divide the tuna mixture in half — one portion per kimbap. For a smaller amount of filling, divide into 3 portions instead.
Season the cooked rice with the salt, sesame seeds, and sesame oil, then mix and divide into 4 portions.
Place the seaweed sheet with the "1" side facing down and at the top, then set the plastic mold on top.
Spread one rice portion (about ¼ cup) evenly across the bottom of the triangle mold.
Add a portion of the tuna mixture on top of the rice, spreading it evenly.
Add another rice portion on top of the filling, spreading it up to the top of the mold.
Press the rice down with the mold's plastic press until it reaches the marked line. Remove the forming tools.
Fold the seaweed sheet up over the rice, fold both sides down and tuck the extra seaweed underneath, then fold the bottom corners up toward the center.
Secure each side with a sticker — the underside has small cuts that make it easier to open later. Repeat with the remaining rice and filling.
Notes & Variations
Requires a triangle kimbap mold and its plastic-wrapped seaweed sheets to shape and wrap cleanly by hand.
No perilla leaves? They give the distinct fresh, peppery flavor here — worth seeking out at a Korean grocer rather than skipping.
For a milder version, cut back the gochujang or leave it out for a plain tuna mayo filling.
Other popular fillings if you want to build your own: bulgogi with kimchi, or pork simmered in gochujang with kimchi — season and cook the filling, then fill the mold the same way.
Best kept at room temperature and eaten within about half a day — the rice hardens over time. Plastic-wrapped versions keep 2–3 days refrigerated, or freeze for up to a month.
Nutrition (approx., per serving): Calories: 220 kcal · Protein: 7g · Carbs: 28g · Fat: 9g · Saturated fat: 2g · Cholesterol: 8mg · Sodium: 233mg · Fiber: 0.5g · Sugar: 1g From a related recipe's nutrition estimate, not this exact filling — treat as approximate.
FAQ
What is triangle kimbap called in Korean?
Samgak kimbap (삼각김밥). If the same rice-and-filling combination isn't wrapped in seaweed, it's called jumeokbap instead.
Is triangle kimbap the same as onigiri?
Not exactly, though they're often compared. Onigiri is the Japanese rice ball; samgak kimbap is a distinct Korean dish with its own name and tradition.
Can you eat it cold, or should it be heated?
Both work — straight from the fridge, or microwaved if you want it warm.
Is it gluten-free?
Not reliably — traditional gochujang and regular soy sauce typically contain wheat. Use gluten-free versions of both if that matters to you.
How many calories are in triangle kimbap?
One recipe's nutrition estimate comes to about 220 kcal per serving, with 28g carbohydrates, 7g protein, and 9g fat. Actual numbers will vary by filling and size.
Can you freeze it, and how long does it last?
Plastic-wrapped triangle kimbap keeps in the fridge for 2 to 3 days, and can be frozen for up to a month if wrapped individually in cling wrap and sealed in a zip-top bag. Versions made without the seaweed film are best eaten the same day for the best texture.
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Jiwon Kim is a home cook from Seoul who studied Food Science and Nutrition. She shares approachable Korean recipes — rice, soup, banchan, and fermented staples — explained simply for cooks outside Korea.
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