A plate of Seared Tuna steak on a pile of quinoa and stir-fried vegetables

Seared Tuna with Quinoa & Stir-Fried Vegetables

This seared tuna with quinoa and stir-fried vegetables is the perfect healthy treat. Its packed with stir-fried vegetables, whole grain carbohydrates, whole proteins and vitamins. It’s the perfect healthy ‘treat’ meal.

Tuna Steak Temperatures

To get the most out of a tuna steak you need to be careful with the temperatures. This includes making sure the fish is kept cool before cooking and the final core temperature.

What to look for when buying Tuna Steak

When buying tuna steak’s you want to shop at a reputable, knowledgeable, good quality fish supplier. The fish should smell fresh and mild, not fishy. The flesh should also be pinkish and not grey.

Make sure to buy your fish last from the supermarket. This way it will stay cooler for longer. Refrigerate as soon as you get home.

Tip: Bring an ice cooler in the car.

Tuna Steak Cooking Temperatures

Now you have bought your fresh tuna steaks, its time for cooking. My favourite way to cook tuna steak is rare to medium rare. Anything above medium you will start to lose its luxurious texture and dry out.

The cooking time varies by the thickness of each tuna steak and how hot your pan is. For beginners the best way to know when your tuna steak is cooked is by using a probe. You want to use a fast, reliable probe like this AMAGARM probe. This is because tuna steaks overcook very quickly.

Rare – 38c to 43c | 100f to 110f

Medium Rare – 43c to 49c |110f to 120f (recommended)

Medium – 49c to 54c |120f to 130f

Medium Well – 54c to 60c | 130f to 140f

Well done – 63c+ | 145+ (not recommended)

How To Cook Quinoa

Cooking quinoa is easy and perfect for batch cooking. I normally cook a few portions at a time to eat over the next few days. For people who would rather cook their quinoa then buy pre cooked, here’s a quick recipe for you.

Serves 2 | 22 Minutes | 250-300g cooked weight.

  • 100 g Quiona 
  • 200 ml Water
  • 1 pinch Sea Salt
  1. Thoroughly rinse the quinoa in a fine sieve under cold water for 30 seconds.
  2. Add the quinoa, water and sea salt to a pot. Quickly bring to a boil then turn down to a light simmer. Cook for 15 minutes until the quinoa has absorbed all the water. 
  3. Turn off the heat and place a lid on the pot. Leave to steam for 5 minutes. 
  4. Take of the lid and fluff the quinoa with a fork. Taste for seasoning then serve.

For the full post with tips, check out How To Cook Quinoa.

This Recipe Is Suitable For

  • Dairy Free
  • Gluten Free
  • Nut Free

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Seared Tuna with Quinoa & Stir-Fried Vegetables

This seared tuna with quinoa and stir-fried vegetables is the perfect healthy treat. Its packed with stir-fried vegetables, whole grain carbohydrates, whole proteins and vitamins. It's the perfect healthy 'treat' meal.
Prep Time15 mins
Cook Time15 mins
Marinading Time30 mins
Course: Main Course
Cuisine: Asian
Keyword: Quinoa, Seared Tuna
Servings: 2 people


  • 2 Mixing bowls
  • 1 Medium Sauté Pan
  • 1 Large Wok or Large Deep Sauté Pan


  • Vegetable Oil
  • 300 g Quinoa Precooked
  • 2 Garlic cloves minced
  • 1 tsp Ginger minced
  • ½ Red onion sliced
  • 1 Mixed Pepper roughly sliced
  • 100 g Snap Peas
  • 1-2 brined Chillies sliced or chilli flakes
  • 80 g Spinach

Tuna Marinade

  • 2 Tuna Steaks 120g each
  • 10 ml Soya sauce light

Stir Fry Sauce

  • 50 ml Soya sauce light
  • 1 Lime freshly squeezed
  • 1 tsp Sesame Oil


  • Coriander
  • Spring Onions sliced
  • Pickled Ginger


Tuna Streak Marinade

  • In a mixing bowl or ziplock plastic bag add the tuna streaks and 10ml of soya sauce. Wrap and leave to marinade in the fridge for atleast 30 minutes.

Stir Fry Sauce

  • In a mixing bowl, whisk together the soya sauce, lime juice and sesame oil. Place to the side

Stir Fry

  • Heat a large wok over medium high heat. Add vegetable oil, ginger and garlic and stir fry for 30 seconds, until frequent. Add red onion, pepper and snap peas then stir fry for 3-4 minutes (adding a tbp of water if the wok gets to hot). Once the vegetables are al dente add the spinach, chilli and stir fry sauce, mixing constantly until the spinach wilts.
  • Turn down the heat to medium low and add the quiona. Slowly heat up, mixing requarlly whilst you cook the tuna steaks.

Tuna Steaks

  • Add a medium sauté pan over high heat. Lightly session the tuna streaks with sea salt and vegetable oil.
  • Once the pan is hot add a dash of vegetable oil and the tuna steaks. For rare to medium rare, sear the tuna steaks on each side for 1-2 minutes (depending how thick the tuna streaks are). The core temperture should be between 49c to 57c.


  • Add the quiona stir fry, tuna steaks and garnish with corriander, spring onions and pickled ginger.

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