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Seared Tuna Steaks with Creamy Garlic Mashed Potatoes

There’s something so effortlessly elegant about seared tuna steaks. I remember the first time I made them for a dinner party. The vibrant pink center, the satisfying sear, the pure taste of the ocean… it was a revelation. I’d always been intimidated by seafood, but that night, the humble tuna steak transformed me from a nervous cook into someone who felt truly confident in the kitchen. And served alongside a comforting mound of garlic mashed potatoes? It was the perfect balance of indulgence and healthy eating, a combination that still makes my heart sing.

Recipe Overview

Prep Time: 15 minutes
Cook Time: 15 minutes
Total Time: 30 minutes
Servings: 2
Dietary Type: Pescatarian

Ingredients

2 tuna steaks
Lemon juice
Pepper
3 potatoes
2 garlic cloves
Low-fat milk
¼ cup soy sauce
1 teaspoon wasabi paste
100 g rocket or 100 g mixed salad greens
1 Lebanese cucumber, sliced thinly
1 small Spanish onion, sliced thinly
Parmesan cheese, shaved
1 tablespoon balsamic vinegar

Equipment Needed

Large pot
Potato masher or ricer
Grill or frying pan
Small bowl
Large bowl

Instructions

Begin by marinating the tuna steaks. Place them in a shallow dish and drizzle generously with lemon juice. Season liberally with freshly ground pepper. Let them sit for at least 10 minutes, or up to 30 minutes in the refrigerator, allowing the flavors to meld.
While the tuna marinates, prepare the mashed potatoes. Peel the potatoes and cut them into evenly sized chunks. Place them in a large pot, cover with cold water, and bring to a boil. Cook until the potatoes are fork-tender, about 15-20 minutes.
As the potatoes cook, prepare the garlic. Finely chop or crush the garlic cloves. I prefer to crush them for a more intense flavor, but finely chopping prevents any large, overpowering pieces in the mash.
Once the potatoes are cooked, drain the water completely. Return the potatoes to the pot. Add the crushed or chopped garlic and a splash of low-fat milk. Begin mashing the potatoes with a potato masher or, for an extra-smooth consistency, use a ricer. Gradually add more low-fat milk until you reach your desired consistency – creamy but not runny. Season with salt and pepper to taste.
Now it’s time to cook the tuna steaks. Lightly spray a grill or frying pan with oil and heat over medium-high heat. The pan should be hot enough to sear the tuna quickly, creating a beautiful crust.
Carefully place the marinated tuna steaks in the hot pan. Cook for about 2-3 minutes per side for a medium-rare finish, or longer if you prefer your tuna more well-done. Remember that tuna continues to cook after being removed from the heat, so it’s best to slightly undercook it. I usually aim for a vibrant pink center.
While the tuna is cooking, prepare the wasabi soy sauce. In a small bowl, combine the soy sauce and wasabi paste. Stir well until the wasabi is fully dissolved. Adjust the amount of wasabi to your personal preference; a little goes a long way!
Assemble the salad. In a large bowl, combine the rocket or mixed salad greens, thinly sliced cucumber, and thinly sliced Spanish onion. Add shaved parmesan cheese.
Just before serving, toss the salad with balsamic vinegar. Don’t overdress the salad; a light coating of balsamic is all you need.
To serve, place a generous spoonful of the garlic mashed potatoes on each plate. Top with a seared tuna steak. Drizzle the wasabi soy sauce over the tuna, or serve it on the side in a small dish for dipping. Accompany with the salad.

Expert Tips & Tricks

Don’t overcook the tuna! The key to perfect tuna steaks is a hot sear and a pink center. Overcooked tuna becomes dry and tough. Use a meat thermometer to ensure your tuna reaches an internal temperature of 125-130°F for medium-rare.
For an even sear, pat the tuna steaks dry with paper towels before cooking. This removes excess moisture and allows the fish to brown properly.
Elevate your mashed potatoes by adding a knob of butter along with the milk for extra richness, or try roasting the garlic before mashing it in for a deeper, sweeter flavor.
If you don’t have rocket or mixed salad greens, baby spinach or even shredded romaine lettuce will work in a pinch.
Make ahead: The mashed potatoes can be made a few hours in advance and gently reheated. The salad can also be prepped ahead of time, but don’t dress it until just before serving to prevent it from becoming soggy.
If you want to make the dish look amazing, you can buy edible flowers to add colour to the dish.

Serving & Storage Suggestions

Serve the seared tuna steaks and garlic mashed potatoes immediately for the best flavor and texture. The contrast between the warm, comforting potatoes and the savory, slightly spicy tuna is truly delightful.

Leftover tuna should be stored in an airtight container in the refrigerator and consumed within 1-2 days. Reheat gently in a pan over low heat, or enjoy cold in a salad or sandwich. The mashed potatoes can also be stored in the refrigerator for up to 3 days. Reheat in the microwave or on the stovetop, adding a splash of milk to restore their creamy consistency. The salad is best enjoyed fresh, but any leftovers can be stored in an airtight container in the refrigerator for up to 24 hours.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	450 kcal	23%
Total Fat	18g	28%
Saturated Fat	5g	25%
Cholesterol	80mg	27%
Sodium	800mg	33%
Total Carbohydrate	40g	13%
Dietary Fiber	5g	20%
Sugars	10g	N/A
Protein	30g	60%

Note: Nutritional information is an estimate and may vary based on specific ingredients and preparation methods.

Variations & Substitutions

Gluten-free: Ensure your soy sauce is gluten-free. Tamari is a great alternative.
Dairy-free: Use plant-based milk (almond, soy, or oat milk) instead of low-fat milk in the mashed potatoes. You can also substitute olive oil or vegan butter for extra richness. Omit the parmesan cheese from the salad.
Spice it up: Add a pinch of red pepper flakes to the wasabi soy sauce for an extra kick.
Herbaceous twist: Stir in fresh herbs like chopped chives, parsley, or dill into the mashed potatoes.
Seasonal salad: Adapt the salad to the season. In the summer, use fresh tomatoes and basil. In the fall, add roasted butternut squash and cranberries.

FAQs (Frequently Asked Questions)

Q: Can I use frozen tuna steaks?
A: Yes, you can use frozen tuna steaks. Thaw them completely in the refrigerator before marinating and cooking. Make sure to pat them dry thoroughly after thawing to remove excess moisture.

Q: How can I tell if the tuna is cooked to the right temperature?
A: The best way to ensure your tuna is cooked to the desired doneness is to use a meat thermometer. Insert the thermometer into the thickest part of the steak. Medium-rare is around 125-130°F.

Q: Can I use regular potatoes instead of the specified type?
A: Yes, you can use any type of potato you prefer for mashed potatoes. Yukon Gold potatoes are naturally creamy and require less milk, while Russet potatoes are fluffier and may need more liquid.

Q: What if I don’t like wasabi?
A: If you don’t like wasabi, you can omit it from the soy sauce mixture. Alternatively, try adding a small amount of grated ginger or a squeeze of lime juice for a similar flavor boost.

Q: Can I grill the tuna instead of pan-searing?
A: Absolutely! Grilling the tuna will give it a smoky flavor. Just make sure your grill is clean and oiled, and cook the tuna over medium-high heat for the same amount of time as pan-searing.

Final Thoughts

This recipe for seared tuna steaks with garlic mashed potatoes is more than just a meal; it’s an experience. The combination of flavors and textures is both satisfying and elegant, perfect for a weeknight dinner or a special occasion. Don’t be afraid to experiment with the variations and substitutions to create a dish that is uniquely yours. I hope you enjoy making and sharing this recipe as much as I do! I can’t wait to hear what you think!

Tuna Steaks With Garlic Mash Potato Recipe