Oven-Baked Tuna in a Roasting Bag

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Welcome to a recipe that combines elegance, simplicity, and healthy eating all in one dish! Baking fish in a roasting bag is a game-changer. This method steams the tuna in its own juices along with aromatic vegetables, ensuring it comes out perfectly moist, tender, and infused with flavor every single time. It's a fantastic technique for anyone who wants a foolproof way to cook fish without it drying out. This Oven-Baked Tuna is perfect for a quick weeknight dinner yet sophisticated enough for a special occasion. Let's get cooking!

A plate of oven-baked tuna with vegetables and a side of brown rice.

Oven-Baked Tuna in a Roasting Bag

Cooking: 35 minutes
Quantity: 3 Servings
Per serving
Calories: 628 kcal
Proteins: 41.5 g
Fats: 13.9 g
Carbohydrates: 43.8 g

Ingredients for Baked Fish in a Roasting Bag

  • 450 g frozen tuna steaks
  • 100 g carrots
  • 100 g celery
  • 100 g onion
  • 5 g ground paprika
  • 5 g fenugreek seeds
  • salt

For the side dish:

  • 150 g brown rice
  • 20 g butter
  • 15 ml soy sauce

How to Make Oven-Baked Tuna in a Roasting Bag

Thaw the tuna steaks on the bottom shelf of your refrigerator. If you are using a whole fish, cut the body into steaks about 2 centimeters (about 0.8 inches) thick.

Raw tuna steaks on a cutting board ready for preparation.

Thawing and slicing the tuna

Add carrots cut into small sticks and similarly chopped celery stalks to the fish. The fish will cook quickly, so the vegetables should not be cut too large, or they will remain raw.

Sliced carrots and celery stalks ready for the recipe.

Slicing the vegetables

Season the tuna and vegetables — sprinkle with fine table salt, add fenugreek seeds and ground paprika. There’s no need to rub the spices into the fish; simply sprinkling them on top is enough.

Tuna steaks and vegetables seasoned with paprika and fenugreek.

Seasoning the tuna and vegetables with salt and spices

Take a roasting bag, open it up, and place the tuna steaks and vegetables inside. Add coarsely chopped onion. Tear off the thin tie from the edge of the bag, tie one end tightly, then cut the bag to the desired length and tie the other end.

Placing seasoned tuna and vegetables inside a clear roasting bag.

Packing the fish and vegetables into a roasting bag

Properly packed products in the bag should look like a large candy in a transparent wrapper.

A sealed roasting bag with tuna and vegetables on a cast-iron skillet.

Placing the sealed roasting bag with fish onto a skillet

Take a baking sheet or a clean skillet. It’s best to use cast iron or any oven-safe dish with thick walls (except for glass).

Preheat the oven to 185°C (365°F) and place the fish on the middle rack. Cook for about 15 minutes. Then, remove it from the oven and let it rest in the bag for another 10 minutes without opening.

Perfectly cooked tuna and vegetables revealed after cutting open the roasting bag.

Cutting the bag open, the tuna is ready

Cut open the bag, and the tuna is ready — tender, aromatic fish with a side of vegetables.

Brown rice cooking in a saucepan on the stove.

Cooking the brown rice

Now, let’s cook the brown rice. In a small, thick-walled saucepan, add 2 g of table salt, the butter, and then the thoroughly rinsed brown rice. Pour in 250 ml of cold water and the soy sauce, and place the saucepan on the stove. After it comes to a boil, reduce the heat to the minimum, and cover the saucepan tightly. Cook for 20 minutes. Wrap the cooked rice in a towel and let it steam for half an hour.

Using a food ring to plate a neat portion of brown rice.

Plating a portion of cooked brown rice

Place a food ring on a serving plate and pack a portion of the brown rice tightly inside.

A beautifully plated dish of baked tuna steak on a bed of brown rice with vegetables.

Placing the cooked tuna on the rice and garnishing the plate with vegetables

And there you have it—a beautifully cooked tuna steak that's as delicious as it is nutritious. The magic of the roasting bag is that it makes a gourmet-quality meal with minimal effort and cleanup. Serve this dish immediately while it's warm, perhaps with a fresh squeeze of lemon juice or a sprinkle of chopped parsley to brighten the flavors. We hope you enjoy this wonderful meal. It’s a testament to how simple ingredients and a smart cooking technique can create something truly special. Happy cooking!