Today’s post is about Tuna Steaks with Lemon Caper Sauce. It is the second in a two post series on tuna. Specifically, preparing this versatile fish using flavors inspired by the Mediterranean. My last post focused on Spanish Inspired Tuna Sandwich. If you haven’t seen it, you should go check it out. Right now though, let’s jump into the tuna steaks.

Tuna is a cornerstone of Mediterranean cuisine. It is celebrated for its versatility across fresh, canned, and preserved forms.

Tuna features prominently in Italian, Spanish, French, Greek, and North African dishes. It adapts to simple everyday meals or gourmet preparations. Its rich, meaty texture and umami flavor pair well with olive oil, herbs, vegetables, and acids like lemon or vinegar. The flavors and nutritional qualities make it a staple in healthy, balanced diets.

Beyond the Mediterranean, tuna is a world wide staple of the sea. It is used in Japanese sushi, Ecuadorian Encebollado, and Hawaiian Poke. Across North America and Europe, canned tuna is widely used. Find it in casseroles, quick meals, and of course sandwiches. Tuna is second only to shrimp as the most commercially important fish in the world today. Historically, only cod has played a more impactful role on the evolution of world civilizations.

All that is nice, but when you’re having a tuna steak for dinner, that isn’t what you are thinking about.

Instead, you want to be sure to cook it to perfection. And you want give it a flavor that will make your mouth water. That is the part that I can help with.

Picking Fresh Tuna Steaks

Tuna steaks are thick cuts from the body of the fish. They typically come from species like yellowfin (ahi), bluefin, or bigeye tuna. Tuna steaks are prized for a firm, meaty texture and rich, savory flavor often compared to beef.

Tuna Steaks and Lemon Caper Sauce - two versatile culinary superheroes come together for a simple and elegant meal

When buying fresh tuna steaks, prioritize quality to ensure safety and optimal flavor. Look for steaks that are moist, shiny, and almost translucent. Find steaks with a vibrant ruby-red color. Avoid any that appear dull, matte, brown, or oxidized, as these indicate age or poor handling.

Frozen Tuna Steaks Work Too

I like fresh tuna, but frankly, frozen tuna is easier to come by where I live and less expensive too. So I will be using frozen tuna in my recipe. Frozen tuna steaks are usually flash-frozen at sea right after being caught. This preserves their freshness, flavor, and nutritional value (e.g., omega-3s, protein) nearly as well as fresh. This process locks in quality, making frozen a reliable option that can offer excellent results if handled properly.

What to look for changes a little bit when buying frozen. Look for steaks that are solidly frozen with a uniform color—bright red to deep pink for species like yellowfin or bluefin. Stay away from packages with excessive ice crystals, discoloration (brown or gray spots), or a matte finish. Any of these suggest freezer burn or improper storage. Vacuum-sealed or individually wrapped steaks minimize air exposure, which preserves quality. As with anything, check the dates for freshness.

To use your frozen tuna steak, you will need to thaw it. For food safety reasons, it is important that you do it the right way. You will want to thaw your tuna steak in the fridge overnight still in its package. Alternatively, you can run it under cold water for 30-60 min.

Once thawed, the steak should feel firm and springy, not mushy or waterlogged. Excessive liquid in the package post-thaw indicates poor freezing. And check the smell once thawed. Tuna should have a mild scent reminiscent of the ocean. A strong fishy or ammonia smell signals spoilage, even if frozen, and you will need to pass on that steak.

Lemon Caper Sauce

The other part of Tuna Steaks with Lemon Caper Sauce is of course the Lemon Caper Sauce. I think that a Lemon Caper sauce is a culinary superhero. It is just one of those things you should learn how to make. Why? Because it is simple, delicious, and goes great with lots of foods.

A lemon caper sauce is the basis of a good chicken piccata. Previously on this blog we’ve used it with scallops. It goes great over vegetables such as asparagus and broccoli and it way easier than Hollandaise sauce to master. A quick look around the web and you’ll find many recipes with lemon caper sauce. Pork tenderloin, salmon, cod — all types of fish really — spaghetti squash, spinach, the list is almost endless. Of course it is great on pasta, Eggs Benedict, and even as a salad dressing. It is also straight forward to make as there really is no reason not to learn how to make it.

Stars of the Lemon Caper Sauce

Let’s take a looked at the essential ingredients that make lemon caper sauce a must-try:

Fresh Lemon Juice: The juice from one large lemon should be enough. It is the lemon that give the sauce its zingy bright flavor. Fresh lemons are an essential kitchen staple for Mediterranean cuisine, and central to this dish

Capers: The other headliner for this sauce. A tablespoon should do. These tiny flavor bombs offer a tangy, briny punch of flavor. Another staple of Mediterranean cooking, and an under-rated addition to many dishes. Some people rinse the capers to control saltiness. I don’t — I just add less kosher salt if necessary. If you don’t already have a jar in your fridge (you should), find them next to the pickles in most grocery stores.

Fresh Parsley: Like with the capers, a tablespoon of chopped parsley will do here. It adds a bright green color, but also a subtle taste of fresh herbs. I prefer the Italian flat leaf variety here, but you can use the curly one too. But don’t substitute dried parsley. That may work in some recipes, but not here.

Supporting Players

While the Lemons and the Capers are essential, don’t skip any of the supporting players. Together, they are what elevate this sauce to a superhero.

White Wine: The white wine sets the base for this sauce. You use immediately after removing the tuna from the pan to deglaze and grab the flavor from the fish. Most of the wine will cook away, but don’t skip it. Don’t use an expensive wine, but do use one you would be willing to drink. I usually go for a dry white wine such as a Pinot Grigio or a Sauvignon Blanc. Do not use anything sold at the store labeled ‘white cooking wine’ — it is nothing but glorified vinegar.

Garlic: One healthy sized clove will work here. You want to have the hint of garlic, but without it overpowering the sauce. The garlic will add a warm and savory base to complement the brightness of the lemons. Feel free to adjust the amount depending on your preferences.

Unsalted Butter: It won’t surprise you to learn that the butter is what brings this whole sauce together. Start with two tablespoons, divided in half. Keep one tablespoon in the fridge until just before you need it. The butter sautés the garlic and creates a rich, creamy texture. This base complements the flavors of lemon and capers.

Kosher salt and fresh ground black pepper: As always, have these on hand. Add and adjust them to your taste and to complement whatever you are pairing with this sauce.

Pan Searing Tuna Steaks

Season Tuna with kosher salt and fresh ground black pepper and then rub with extra virgin olive oil. Some people like to put a squeeze of lemon juice on here — I don’t and here’s why. First — the acid will begin to ‘cook’ the tuna, like in ceviche. You don’t want that here. Second — the liquid will create a ‘wet’ surface on the tuna. That in turn inhibits a nice crust developing during the searing. We’re going to be adding plenty of lemon flavor later, so skip it for now.

TIP: Have all your ingredients for the lemon caper sauce ready to go. Be ready before you begin searing your tuna steaks. You will not have time to be scrambling once the tuna steaks are in the pan.

Tuna steaks are best when cooked quickly over high heat. Ideally, the center should be rare to medium-rare. Overcooked tuna drys out and lose its delicate texture. Remember, tuna steaks cook fast, so don’t walk away or else you might be eating shoe leather.

Heat pan to medium high heat. When the pan is hot, give it a shot of a high heat spray oil such as avocado oil or refined coconut oil. Add the tuna steaks when the spray oil is shimmering.

Sear for about two minutes on each side. Aim for a nice brown crust on the outside and rare to medium rare on the inside. Your steaks will take just a few minutes to cook, and you really can’t just walk away. Don’t touch them in the pan, but do pay attention to them. There is a fine line between delicious brown crust and acrid, bitter black burnt crust. You don’t want to cross that line.

Ditch the Non-Stick Pan

The other trick to getting a good crust is to use a pan without a non-stick coating. Yes, I love my non-stick pans, and they work for a good many tasks. But they just don’t cut it when you are more concerned with creating the brown crust. It just won’t form in a non-stick pan because, well, your food won’t stick to the pan. In fact, you want it to ‘stick’ to the pan a bit with the tuna steaks.

Once you put the tuna steaks in the pan, do not touch them. Leave them alone. Set a timer for two minutes, and start it. Use this time to get a clean plate ready to put the tuna steaks on to rest while you make the lemon caper sauce. You’ll want that ready.

When the timer goes off, turn the tuna steaks and you should see the nice brown crust formed. If the tuna is ‘stuck’ to the pan, try the other one and then come back to it. It will become ‘unstuck’ on its own when the crust is nicely formed.

Once they are both turned over, set the timer for another two minutes. Again, leave the tuna steaks alone. When the timer goes of a second time, move them to the clean plate you just pulled out. Cover them loosely with foil or an upside down bowl. Let them rest while you prepare the lemon caper sauce.

Making the Sauce

I like to turn the pan off as I begin the next step. You will turn it back on, but a bit of cooling is OK at this point.

Once the tuna steaks are resting, add the white wine to the pan to deglaze it. Add the wine and begin to scrape the pan with a spatula. You’ll want to get those bits of browning and tuna left in the pan and incorporate them into your sauce.

Turn the heat back on and add a tablespoon of butter.

Bring to a light simmer and allow the butter to melt and the wine to cook off. Once the butter has melted, add the garlic and cook until just softens and fragrant.

By this point, you should be seeing larger bubbles in the butter. This is a sign most of the wine has cooked off. Add the lemon juice to cool the butter and keep it from browning. Add the capers as well and heat for about a minute. Stir to combine it all together.

Remove from heat again, and add the remaining tablespoon of chilled butter. Swirl around the pan until melted — it will thicken the sauce a bit. Add parsley and the sauce is done.

Plating and wrapping up.

At this point, if you’d like you can return the tuna steaks to the pan to coat with the sauce. That is what I do for my scallops, but I skip it here. Instead, I slice the now rested tuna steaks across the grain to expose the pink medium center.

I like to put a small pool of the lemon caper sauce on the plate. I then put the tuna slices directly on top of that pool. Finish by spooning more sauce over the top. Finish with some chopped fresh parsley for garnish.