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Keto Seared Tuna with Fennel and Pesto

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Here's an easy 5-ingredient keto meal that can be prepared in just 15 minutes! Tender tuna steaks served with crunchy balsamic fennel and herb pesto. You can use a classic basil pesto or make your own pesto using any herbs, nuts, seeds and aromatics.

Apart from tuna, this recipe will work well with skin-on or skinless chicken breasts. Chicken will take longer to cook and the time will depend on the thickness. Skinless chicken breasts will be nutritionally closer to tuna but skin-on chicken breasts will be more delicious and they will provide extra flavor!

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Hands-on Overall

Serving size 1 steak with fennel and pesto

Allergy information for Keto Seared Tuna with Fennel and Pesto

✔  Gluten free
✔  Dairy free
✔  Egg free
✔  Nut free
✔  Nightshade free
✔  Pork free
✔  Avocado free
✔  Coconut free
✔  Shellfish free
✔  Beef free
Pescatarian

Nutritional values (per serving, 1 steak with fennel and pesto)

Net carbs8.1 grams
Protein40.7 grams
Fat42.8 grams
Calories598 kcal
Calories from carbs 6%, protein 28%, fat 66%
Total carbs13.8 gramsFiber5.7 gramsSugars6.5 gramsSaturated fat6.1 gramsSodium826 mg(36% RDA)Magnesium93 mg(23% RDA)Potassium1,390 mg(69% EMR)

Ingredients (makes 1 serving)

  • 1 tuna steak (150 g/ 5.3 oz)
  • sea salt and pepper, to taste
  • 2 tbsp basil pesto (30 ml) - you can make your own pesto
  • 2 tbsp extra virgin olive oil (30 ml)
  • 1/2 tsp balsamic vinegar
  • 1/2 small fennel, core removed (150 g/ 3.5 oz)

Instructions

  1. Pat dry the tuna steaks with paper towel and brush with about a teaspoon of olive oil. Season with salt and pepper on both sides. Keto Seared Tuna with Fennel and Pesto
  2. Remove the fennel fronds and cut it in half. Cut out the core and discard. Finely slice the fennel, or place in a food processor and slice using the fine slicing blade. Place in a mixing bowl. Pour olive oil and balsamic vinegar over the fennel and toss to combine. Set aside.
    Note: If you don't like your fennel too crunchy, cook in a pan over a medium-high heat for 2 to 3 minutes. Keto Seared Tuna with Fennel and Pesto
  3. Sear the tuna for 1-2 minute (rare) to 2-3 minutes (medium) per side. The time needed to cook the tuna will also depend on the thickness of your steaks. If the thickness is 1 inch (2 1/2 cm) or more, cook for 2 to 4 minutes per side. When cooked, transfer to a chopping board and let it rest for 3 to 5 minutes before slicing. Keto Seared Tuna with Fennel and Pesto
  4. Serve with the prepared fennel and pesto. Optionally, add fresh herbs such as parsley and/or edible flowers. Eat while still warm. Keto Seared Tuna with Fennel and Pesto

Ingredient nutritional breakdown (per serving, 1 steak with fennel and pesto)

Net carbsProteinFatCalories
Tuna, yellowfin (fresh)
0 g36.6 g0.7 g164 kcal
Salt, sea salt
0 g0 g0 g0 kcal
Pepper, black, spices
0.1 g0 g0 g1 kcal
Nut-Free & Dairy-Free Pesto, homemade (KetoDiet blog)
1.2 g2.2 g14.8 g146 kcal
Olive oil, extra virgin
0 g0 g27 g239 kcal
Balsamic vinegar, dark (excludes sweet, syrupy vinegar)
0.5 g0 g0 g2 kcal
Fennel bulb, fresh
6.3 g1.9 g0.3 g47 kcal
Total per serving, 1 steak with fennel and pesto
8.1 g40.7 g42.8 g598 kcal

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Martina Slajerova
Creator of KetoDietApp.com

Martina Slajerova

I changed the way I ate in 2011, when I was diagnosed with Hashimoto’s, an autoimmune disease that affects the thyroid. I had no energy, and I found it more and more difficult to maintain a healthy weight.

That’s when I decided to quit sugar, grains, and processed foods, and to start following a whole-foods-based ketogenic approach to food.

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