This bluefin tuna tartare is an indulgent, umami-forward appetizer that replaces avocado with silky roasted bone marrow. Sushi-grade tuna is finely diced and dressed in a warm, citrus-forward ponzu, then piled onto marrow-toasted baguette slices for a satisfying crunch. A quick pass with a torch adds a gentle smokiness before the tartare is finished with glossy eel sauce and a thin serrano slice for heat. Elegant and balanced, this small bite marries rich marrow, clean raw tuna, and bright acidity—ideal for refined entertaining.
Table of Contents
- About the Taste
- Prep the Ingredients
- Ingredient Swaps
- Similar Tartare Recipes
- How to Serve
- Bluefin Tuna Tartare with Roasted Bone Marrow FAQ
- Nadia’s Tips
- Bluefin Tuna Tartare with Roasted Bone Marrow Recipe
About the Taste
These tartines are a favorite at dinner parties. The raw bluefin delivers a clean, silky texture while the ponzu brings brightness and umami. Light torching softens the sharper edges of the dressing and adds a whisper of char. Roasted bone marrow contributes a deep, buttery richness that rounds the dish without overpowering the fish. Toasted baguette provides a crisp base, giving each bite a pleasing contrast between crunchy and creamy. The result is a composed, restaurant-worthy appetizer that feels both modern and comforting.
Prep the Ingredients
- The Bone Marrow: Cover the bones with cold water and soak for at least 2 hours, changing the water if it becomes cloudy. Roast the bones for about 25 minutes. Reserve the rendered fat from the baking sheet to toast the bread.
- The Tuna: Use sushi-grade bluefin tuna. Keep it chilled until you’re ready to chop. Prepare the lemon zest and finely chop the chives so they are ready to add immediately after the tuna is diced.
- The Toast: Slice the baguette horizontally and set aside the top half for another use. Cut the sturdier bottom half into 8–10 thin slices so the tartare sits securely on each piece.
- The Ponzu Dressing: Mince the shallot very finely and measure all ingredients before mixing so the dressing comes together smoothly. The ponzu can be made a day ahead and refrigerated.
- The Eel Sauce: This is a simple, equal-parts reduction of soy, sugar, and rice vinegar. Make it in advance and cool completely before using.
- The Toppings: Trim chervil into small pieces and slice the serrano thinly for finishing the tartines.
Ingredient Swaps
- If bluefin is unavailable, other sushi-grade tunas will work. Texture and richness will vary slightly.
- Beef marrow is traditional; veal marrow offers a milder, softer profile if preferred.
- If you don’t have prepared ponzu, mix soy sauce with rice vinegar and a touch of sugar for a quick substitute.
- Use a sturdy sourdough or country loaf if a baguette isn’t on hand—choose a crust that holds toasting well.
- Fresno peppers make a good stand-in for serrano, with a touch more sweetness and comparable heat.
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Similar Tartare Recipes
- Beef Tartare: Finely chopped raw beef seasoned with mustard, herbs, and cured egg yolk, served with crunchy bread for a classic brasserie-style starter.
- Scallop Tartare: Diced bay scallops with bright aromatics and a touch of cream—a delicate raw seafood starter with sweet, clean flavors.
- Salmon Tartare: Sushi-grade salmon chopped and lightly dressed with herbs and citrus for a softer, more delicate tartare option.
How to Serve
Prickly Pear Cocktail: A bright, floral gin cocktail with yuzu and blood orange makes a refreshing start and complements the tartare’s citrus notes.
Steak Frites: A hearty main of steak and crispy fries with béarnaise brings satisfying contrast to the lightness of the tartare.
Arugula Fennel Salad: A simple green salad with shaved fennel and honey-dijon dressing provides a crisp, bright side.
Amaretto Peaches: Warm, sautéed peaches with amaretto and vanilla ice cream finish the meal on a sweet, comforting note.
Cocktails
Prickly Pear Cocktail
Mains
Steak Frites
Sides
Arugula Fennel Salad
Desserts
Amaretto Peaches
Bluefin Tuna Tartare with Roasted Bone Marrow FAQ
Yes, provided you start with sushi-grade tuna from a reputable source and maintain proper cold storage. Handling and temperature control are the most important safety factors.
You can prepare components in advance, but mix the tuna with the dressing close to serving. Dressing too early softens texture and mutes flavor.
Torching is a finishing technique that adds warmth and surface contrast without cooking the interior. It enhances aromatics and brings the flavors together.
Typically yes. The tuna remains cold, even when the surface receives a quick torch for contrast.
This version is richer due to the bone marrow, but the marrow plays a supporting role; the tuna remains the star.
Nadia’s Tips
- Always choose sushi-grade fish from a trusted seller. If you don’t have a local fish counter, order from reputable suppliers or specialty purveyors.
- Keep everything cold until the last moment. Chilled tuna maintains a firm texture and a clean flavor; chilling your bowl and knife helps in a warm kitchen.
- The torch is a finishing touch—make a quick pass for warmth and surface color rather than cooking through.
- Bone marrow adds richness but doesn’t have to dominate. Start with a modest amount and adjust to taste after you sample the mixture.
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4 servings
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Equipment
- saucepan
- mixing bowl
- rimmed baking sheet
- tongs or spoon
- knife
- cutting board
- 2 spoons
- kitchen torch
Ingredients
Eel Sauce
- ¼ cup soy sauce
- ¼ cup sugar
- ¼ cup rice vinegar
Ponzu
- 2 tbsp soy sauce
- 1 tbsp mirin
- 1 tbsp rice vinegar
- 1 ½ tsp sugar
- 1 small shallot, minced
- 1 pinch bonito flakes
Tuna
- 4 marrow bones, soaked in cold water for a minimum of 2 hours
- 8 oz bluefin tuna, sushi-grade
- 1 lemon, zest only
- 2 tbsp chives, chopped
For Serving
- 1 large baguette
- chervil, for topping
- 1 serrano pepper, thinly sliced, for topping
Instructions
- Make the Eel Sauce: Combine soy sauce, sugar, and rice vinegar in a saucepan. Simmer until reduced by about one third and the sauce thickly coats the back of a spoon. Remove from heat and cool completely.
- Prepare the Ponzu: Whisk together the ponzu ingredients—soy, mirin, rice vinegar, sugar, minced shallot, and a pinch of bonito. Let the mixture sit to meld; it can be made a day ahead.
- Preheat and Roast the Marrow: Preheat the oven to 425°F (218°C). Drain the soaked marrow bones, place them on a rimmed baking sheet, and roast for 20–25 minutes. Reserve the rendered fat at the bottom of the pan. Scoop the roasted marrow from the bones and set aside.
- Toast the Bread: Slice the baguette in half horizontally and reserve the top for another use. Cut the bottom half into 8–10 slices. Brush each slice with the reserved marrow fat and toast in a pan until golden and crisp.
- Make the Tuna: Finely dice the bluefin tuna and combine it with lemon zest. Chop the roasted marrow and fold it into the tuna with the chives.
- Finish and Serve: Warm the ponzu until it is hot to the touch but not boiling, then toss it with the tuna. Scoop and press portions with two spoons, place a spoonful on each toasted baguette slice, and top each with about 1 tablespoon of ponzu. Briefly torch the surface until lightly golden. Drizzle with eel sauce and garnish with a small piece of chervil and a thin slice of serrano.
Nutrition
Nutrition information is automatically calculated and should be used as an approximation.