This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases.
Cucumber Sushi Boats with Sriracha Aioli
If sushi and a crunchy cucumber had a gorgeous, low-carb baby, this would be it. These cucumber sushi boats ditch the rice entirely and let a crisp, refreshing cucumber do all the heavy lifting. The result? All the fresh, briny, umami-packed flavor you love about sushi — with a satisfying crunch and zero rolling-mat drama.
We’re talking sushi-grade yellowfin tuna marinated in soy sauce, rice wine vinegar, sesame oil, and a whisper of honey, then nestled into a cucumber “boat” with creamy avocado, zippy scallions, and delicate micro-greens. The grand finale? A swoosh of sriracha aioli made with kewpie mayo, sriracha, and a bright squeeze of lemon. It’s the kind of dish that looks like you fussed for hours but actually took about 15 minutes. (Your secret’s safe with me. 🤫)
Why Cucumber? Why NOT Cucumber.
Cucumbers are cool, crisp, refreshing, and structurally built for this moment. When you slice one lengthwise and scoop out the center, you’ve got a natural little canoe that’s begging to be filled with something spectacular. No rolling, no seaweed, no steamed rice to stress over — just pure, clean crunch holding everything together beautifully.
The Star of the Show — Sushi-Grade Yellowfin Tuna
This recipe doesn’t mess around. Sushi-grade yellowfin tuna is the real deal — silky, rich, and buttery in a way that makes every bite feel luxurious. Make sure you’re sourcing it from a reputable fishmonger or specialty grocery store. “Sushi-grade” matters here. This isn’t the time to cut corners (pun absolutely intended).
The Lineup — What Goes Inside These Beauties
Here’s what makes these boats sing:
- 🥑 Avocado — creamy, dreamy, and basically tuna’s soulmate
- 🧅 Scallions — a little bite, a little brightness
- 🌿 Microgreens — fancy, nutritious, and wildly photogenic
- 🍶 Soy sauce + rice wine vinegar — umami and tang in perfect harmony
- 🫙 Sesame oil + honey — nutty depth meets a whisper of sweetness
Toss it all together and you’ve got a filling that could honestly star in its own recipe. But then we drizzle…
The Sriracha Aioli That Will Change Your Life (Dramatic, But True)
Three ingredients. Maximum impact. Sriracha, Kewpie mayo, and fresh lemon juice come together in a creamy, spicy, tangy drizzle that takes these boats from great to absolutely unhinged — in the best possible way. Kewpie is non-negotiable here; its eggy richness is what makes the aioli taste like something from a restaurant. You’ve been warned.
Low-Carb, Gluten-Free Friendly & Still Totally Satisfying
These sushi boats are naturally low-carb and can easily be made gluten-free (just swap regular soy sauce for tamari). They’re light enough to not weigh you down, but filling enough to actually satisfy — the tuna, healthy fats from avocado, and all those bold flavors make sure of that. They work beautifully as an appetizer, a starter, a light lunch, or an impressive party snack.
Tips for Making the Best Cucumber Sushi Boats
Chill your serving platter for an extra-fancy touch at parties.
Choose a thick, straight English cucumber — it’s easier to hollow and holds more filling.
Dry the inside of the cucumber with a paper towel before filling so it doesn’t get watery.
Make the aioli first — it gets better as it sits.
Slice the tuna just before serving for the freshest flavor and texture.
What’s in the sushi boats
- sushi-grade yellowfin tuna
- cucumbers
- avocado
- micro-greens
- scallions
- lemon
- low-sodium soy sauce
- kewpie mayo
- rice vinegar
- sesame oil
- honey
- sriracha
Cucumber Sushi Boats
Light, healthy and so easy to make. You don’t need rice or seaweed for this quick and easy sushi boat. Any sushi grade fish will work great. Or cooked fish will work well if you can’t get sushi grade fish. Simply slice an English or hothouse cucumber down the middle length-wise and scoop out the middle seeds to create a hollowed out boat. Top with fish tossed in a tangy soy sauce mix, sprinkle sesame seeds and drizzle sriracha aioli and you have yourself a deliciously satisfying sushi meal.
- Category: Appetizer, Lunch
- Cuisine: Japanese
- Diet: Low-Carb
Ingredients
Cucumber Sushi Boats
- 12 to 16 ounces sushi grade ahi tuna, diced into small cubes
- 3 tablespoons low sodium soy sauce
- 1 tablespoon rice vinegar
- 2 teaspoons sesame oil
- 2 teaspoons honey
- 3 scallions, finely chopped
- 1 large avocado, diced small
- sprouts
- 1 teaspoon sesame seeds
- 2 large or 3 small cucumbers
- flaky sea salt
Sriracha Aioli
- 1/4 cup kewpie mayo
- juice of half lemon
- 1/4 cup sriracha (according to taste)
- pinch of salt
Instructions
Cucumber Sushi Boats
- In a small mixing bowl, whisk together soy sauce, rice vinegar, sesame oil, honey and lemon juice. Add the diced tuna and scallions and toss it together until mixed well. Gently fold in the diced avocado and sprouts. Set aside.
- Slice the cucumbers lengthwise down the middle. With a spoon, scoop out the center seeds. Spoon the tuna mixture on to the cucumber boats.
Sriracha Aioli
- In a small bowl, whisk together all the aioli ingredients, kewpie mayo, lemon juice, salt and sriracha. If you have a squeeze bottle, use a funnel to to get your aioli into the bottles. Drizzle aioli over your cucumber sushi boats. Alternately, you can drizzle with a spoon.) Sprinkle sesame seeds and flaky sea salt on top.
Notes
- If you are not sprinkling any flaky sea salt on top of your boats, add about 1/2 teaspoon of salt to your soy sauce mixture.
❓ FAQ’s for Cucumber Sushi Boats
English (hothouse) cucumbers are ideal — they’re long, have thin skin, and contain fewer seeds, which means more room for your fillings and less wateriness.
Sushi-grade means the fish has been handled and frozen specifically to be safe for raw consumption. Always buy from a trusted source — a good fishmonger or a quality seafood counter — and tell them it’s for raw eating. Your stomach will thank you.
Absolutely! Sushi-grade salmon works beautifully here, or try cooked shrimp or imitation crab if you’d prefer something not raw. The vibe stays the same — the filling just switches characters.
The aioli can be made 2–3 days ahead. The tuna filling is best made fresh and served within an hour or two. You can prep your cucumber and veggies ahead, then assemble right before serving for best results.
You can, but Kewpie’s richer, slightly sweeter profile is genuinely what makes this aioli pop. Check the Asian foods aisle or order it online — once you try it, regular mayo will feel like a downgrade.
Pretty much, yes! The honey adds a small amount of sugar, but it’s minimal. Skip it or reduce it if you’re strictly keto and you’re golden.
After hollowing it out, pat the inside dry with a paper towel. Assemble and serve promptly — these are best eaten fresh, not left sitting overnight.
Yes! Swap the tuna for diced mango or seasoned tofu, and use a vegan mayo in the aioli. Still gorgeous, still delicious, still Pinterest-worthy.
SHOP FOR THIS RECIPE
Purple Ube Chia Pudding
Matcha Chia Seed Pudding
Balthazar Inspired Salad with Lemon Truffle Dressing
Homemade French Onion Dip
Chewy, Fudgy Black Cocoa Brownies
Coconut Cream Buns | Lai Yau Bao
Crispy and Chewy Shanghai UBE Mochi Tots
Shanghai Butter Mochi Tots
Real Ice Cream Might Be Good for You