This easy recipe for pan-seared tuna steaks with tomato spinach sauce has ALL the good tastes, and is ready in a half hour! And if you want to take it to the next level, try it served over creamy, dreamy polenta or grits. Healthy deliciousness!

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Why we love this recipe ❤️
We do love this delicious conglomeration of sweet onion and tomato and spinach sauce poured over seared sliced tuna for SO many reasons…let me count the ways!
First tuna steaks. They are one of the easiest (and most forgiving!) seafoods I know…unlike the more fragile fishies like filet of sole, tuna steaks are scrumptiously sturdy, and all they need is a sprinkle of salt and pepper and a quick sear in your favorite frying pan.
Next up, the sauce…a super easy mixture of chopped sweet onion and tomatoes and spinach that you ladle over your sliced tuna. Vegetables with dinner, CHECK! ✅
I like to serve this seafood supper over grits, but pasta, polenta, rice or even mashed potatoes would work…or you can serve it just as it is, with some bread to mop up all that sauce. Oh, the possibilities!
How to make this recipe 👩🏻🍳
Heat half of the oil in a heavy deep skillet over medium high heat. Saute the onion until tender, about 5 minutes, and then stir in the tomatoes, spinach and capers. Cook over medium low heat until everything is thick and tender.
While the veggies are cooking, put the rest of the oil in another large skillet (if you have a cast iron one, this is the time to break it out!), sprinkle the tuna with salt and pepper and sear the tuna for 3-5 minutes on each side, depending on how rare you like it.
Slice the tuna into strips and serve covered with the tomato spinach sauce. It’s delectable all on its own, but if you want some grains with your tuna, serve over polenta or rice.
What to serve with this recipe 🍽️
We love serving this seafood supper over fresh corn polenta or mashed potatoes, or with some sheet pan bread on the side. And for dessert? Let’s have an easy strawberry cheesecake tart!
Other tuna recipes we love! 🐟
We want to know what you think! 🤔
If you try this recipe, we would love to hear how it came out for you! I’d be super grateful if you could leave a star rating (you pick how many stars! 🌟 ) and your thoughts in the Comments section below the recipe card. Thank you!
Pan-Seared Tuna Steaks with Tomato Spinach Sauce
This easy recipe for pan-seared tuna steaks with tomato spinach sauce has ALL the good tastes, and is ready in a half hour!
- Prep Time: 10 minutes
- Cook Time: 30 minutes
- Total Time: 40 minutes
- Yield: 2
- Category: Dinner
- Method: Stovetop
- Cuisine: American
Ingredients
- 1/4 cup olive oil
- 1 sweet onion, peeled and chopped
- 1/2 pound plum tomatoes, chopped
- 3 cups baby spinach
- 2 tablespoons capers
- 2 four ounce tuna steaks (about an inch thick)
- Salt and pepper
Instructions
- Heat half of the oil in a heavy deep skillet over medium high heat. Saute the onion until tender, about 5 minutes, and then stir in the tomatoes, spinach and capers. Cook over medium low heat until everything is thick and tender.
- While the veggies are cooking, put the rest of the oil in another large skillet (if you have a cast iron one, this is the time to break it out!), sprinkle the tuna with salt and pepper and sear the tuna for 3-5 minutes on each side, depending on how rare you like it.
- Slice the tuna into strips and serve covered with the tomato spinach sauce. It’s delectable all on its own, but if you want some grains with your tuna, serve over polenta or rice.
Adina says
Funny post, it made me laugh. :) I love the sound of this dish and I don’t find the picture so bad either, you are too harsh on yourself. But I know what you mean, the pictures don’t always make justice to a dish. I would love to try this, I was never very lucky with tuna, I tend to over cook it, but this sounds so easy, I might actually manage. :)
Thanks Adina – this made me smile! I hope you do try this – if you love tuna, I know you will love this! :)
Thao @ In Good Flavor says
We must be thinking on the same wavelength, because I just worked on a salmon and grits recipe! You might not be happy with the photo, but looking at it makes me want to dig right in! It looks scrumptious!! I think we all can relate to your wreath hanger conundrum. I’m glad your husband was able to make lemon out of lemonade this time. :)
Thao @ In Good Flavor says
Oh no, I meant to say “lemonade out of lemons”! :)
Ha! I figured. :)
OOOOh, salmon and grits! Seafood and grits were just Meant To Be. :)
Mary Ann | The Beach House Kitchen says
I think it looks delicious Kate! So glad you shared!
Aw, thanks Mary Ann! Good summer beach eating, right? :)