This ahi tuna marinade combines soy sauce, lemon juice, brown sugar, fresh ginger, garlic, and a few drops of toasted sesame oil. Whisk it together in minutes, marinate the tuna for 15 to 30 minutes, then sear and slice for rice bowls, salads, or an easy seafood dinner.
Quick Look: Ahi Tuna Marinade
- What it is: A bright soy-ginger marinade that gives ahi a salty-sweet glaze and a deep sear while the center stays rosy and tender.
- Why this version works: Six pantry ingredients and a short marinade. Soy and lemon start to "cook" tuna if it sits too long, so a quick soak adds flavor without turning the fish mushy.
- Key Ingredients: Soy sauce, lemon juice, brown sugar, fresh ginger, garlic, and toasted sesame oil.
- Total Time: About 30 minutes, including marinating and searing.
- Serve it with: Jasmine rice, sliced avocado, cucumber, and green onions for an easy poke-style bowl.
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Buying Ahi Tuna
Look for steaks cut from the loin, about 1 inch thick, with firm flesh that holds together. Skip any pieces that look ragged or are falling apart.
When the fish counter doesn't have anything I like, I buy frozen tuna. Individually wrapped steaks are handy to keep in the freezer. The vacuum-sealed plastic should fit tightly around the fish with no tears, leaks, or air pockets. If the seal is loose, choose another package, and check the label for thawing instructions.
Keep the tuna refrigerated until you're ready to marinate.
I've also cooked fresh blackfin tuna caught here in the Florida Keys. For that recipe, I coated the loin in panko and pan-fried it. It made a wonderful meal!
Ingredients
See the recipe card below for amounts.
For the Marinade
- Soy sauce: Use regular or low-sodium soy sauce, or substitute coconut aminos for a slightly sweeter flavor and less sodium. Check the label, since sodium varies by brand.
- Lemon juice: Freshly squeezed. Lime juice or rice wine vinegar also work.
- Brown sugar: Balances the salt and lemon.
- Fresh ginger: Peeled and finely grated.
- Garlic: Minced or grated.
- Toasted sesame oil: Just a few drops for its nutty flavor.
For The Tuna
- Ahi tuna steaks: About 1 inch thick and evenly cut.
- Cooking oil: Vegetable oil or clarified butter for searing.
Optional Toppings and Sauce
- Green onions: Thinly sliced.
- Sesame seeds or furikake: Sprinkle over the sliced tuna before serving.
- Spicy mayo: Serve on the side for dipping.
How to Marinate and Sear Ahi Tuna
Step 1: Mix and marinate. Whisk together the soy sauce, lemon juice, brown sugar, ginger, garlic, and sesame oil. Place the tuna in a shallow dish or resealable bag, add the marinade, and turn to coat. Cover and refrigerate for 15 to 30 minutes, turning once.
Step 2: Drain and dry. Lift the tuna from the marinade and discard the used marinade. Gently blot the surface with paper towels and brush off any pieces clinging to the surface.
Step 3: Sear. Heat a heavy skillet over medium-high heat and add enough oil to lightly coat the bottom. Sear 1-inch tuna steaks for about 30 seconds per side, watching the edges change color. When the cooked portion reaches about ¼ inch up the side, flip and repeat. The center should remain rare. Timing varies with thickness and pan heat, so cook longer if you prefer.
Step 4: Slice and Serve. Transfer the tuna to a cutting board and rest for 3 to 5 minutes. Using a sharp knife, slice across the grain. Finish with sliced green onions and toasted sesame seeds or furikake, if desired.
Chef's Tips
- Keep the marinating time short. Refrigerate for 15 to 30 minutes. Soaking the fish in citrus for too long can change its texture.
- Dry the surface before searing. Excess marinade can steam the fish, and pieces of the ginger and garlic can burn in the pan.
- Use a sharp knife. Slice across the grain with smooth strokes to keep the pieces intact.
Serving Suggestions
Serve the sliced tuna over steamed jasmine rice with avocado, cucumber, and green onions. Add Japanese spicy mayo for dipping.
It also works over a big green salad or alongside steamed vegetables.
Sprinkle with toasted sesame seeds or furikake just before serving.
Use the sliced tuna in my Seared Tuna Rice Bowl with jasmine rice, avocado, cucumber, and spicy mayo.
Storage
Serve this tuna right after searing. If you have leftovers, refrigerate promptly in an airtight container and use within 1 day.
Keep unused marinade refrigerated for up to 2 days. Discard any marinade that has touched raw fish.
Ahi Tuna Marinade FAQ
Marinate ahi tuna for 15 to 30 minutes in the refrigerator. This lemon-based marinade is best for a short soak, since the acid can start to cook the tuna.
Remove the tuna from its vacuum-sealed packaging and place it in a covered dish in the refrigerator overnight. For a quicker thaw, put the unwrapped tuna in a new leakproof bag and submerge it in cold water, changing the water every 15 minutes. It defrosts quickly.
Not with this marinade. The lemon juice can make the surface firm or mushy during a long soak. Mix the marinade a day ahead if needed, then add the tuna 15 to 30 minutes before cooking.
Yes. Substitute the same amount of coconut aminos. They taste sweeter and have less sodium than regular soy sauce. You can reduce or leave out the brown sugar if you prefer.
Furikake is a Japanese seasoning usually made with sesame seeds, dried seaweed, salt, and sugar. Some blends also contain dried fish. Sprinkle it over the sliced tuna or rice just before serving.
If you tried this Ahi Tuna Steak Marinade or any other recipe on my blog, please leave a 🌟 star rating and let me know how it goes in the comments. I love hearing from you!
Ahi Tuna Marinade
Equipment
- Medium bowl
- Wire whisk
- Cast-iron or non-stick skillet
- Tongs
- Sharp knife
- Cutting board
Ingredients
Marinade
- 3 tablespoons soy sauce or coconut aminos
- 1 tablespoon lemon juice
- 1 teaspoon brown sugar
- ½ teaspoon grated ginger, fresh, peeled
- 1 teaspoon minced garlic or 1 small clove
- toasted sesame oil (a few drops)
Cooking
- 1 pound tuna steaks (yellowfin, bigeye, or blackfin)
- 1 tablespoon vegetable oil or clarified butter
Optional toppings
- green onions, thinly sliced
- toasted sesame seeds or furikake seasoning
- dipping sauce
Instructions
- Whisk together the soy sauce, lemon juice, brown sugar, ginger, garlic, and toasted sesame oil in a flat, deep dish
- Add the tuna to the dish and turn to coat. Cover and refrigerate for 15 to 30 minutes, turning once.
- Lift the tuna from the marinade and discard the used marinade. Gently blot the surface with paper towels and brush off any pieces clinging to the surface.
- Heat the olive oil or avocado oil in a heavy skillet over medium-high heat. Sear the tuna for about 30 seconds per side, watching the edges change color. When the cooked edge reaches about ¼ inch up the side, flip and repeat. Timing varies with thickness and pan heat. Cook longer if desired.
- Rest for 3 to 5 minutes, then slice across the grain with a sharp knife. Serve with green onions, sesame seeds or furikake, and dipping sauce, if desired.
Notes
- Marinating time: Refrigerate the tuna in the marinade for 15 to 30 minutes.
- Soy sauce substitute: Use low-sodium soy sauce or coconut aminos. Coconut aminos will give the marinade a sweeter flavor.
- Slicing: Use a sharp knife to slice the tuna across the grain.
- Storage: Keep unused marinade in a sealed container in the refrigerator for up to 2 days. Store leftover seared tuna separately in an airtight container and use within 1 day.
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