Seared Tuna Steak with Chimichurri — The High Protein Dinner That Feels Like a Restaurant
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Made this on a Thursday because I had two tuna steaks in the fridge and exactly twenty minutes before the kids started asking what was for dinner. What came out of that pan stopped everyone mid-conversation. A tuna steak seared hard and fast until the outside is deeply crusted and the inside is still cold-pink and silky — the kind of thing you pay forty dollars for at a restaurant — with a chimichurri so bright and garlicky it makes everything it touches better. That was dinner on a Thursday. It has been on rotation every week since.
Tuna steak is one of the most underused proteins in the home kitchen. People walk past it at the fish counter because it seems complicated or intimidating — something that belongs in a restaurant, not a weeknight pan. The reality is that tuna steak is one of the fastest proteins you can cook. Two to three minutes per side in a screaming hot pan and it is done. The trick — the only trick — is not overcooking it. A tuna steak cooked all the way through is dry and disappointing. One cooked to rare or medium-rare in the centre is an entirely different experience: silky, rich, deeply flavoured and as satisfying as the best piece of beef you have ever eaten.
The chimichurri is the other half of this recipe. The South American herb sauce — olive oil, fresh parsley, garlic, red wine vinegar, chilli — takes five minutes to make and transforms the tuna completely. The acidity cuts through the richness of the fish, the garlic amplifies the savouriness, the fresh herbs lift everything. It is the sauce that makes people ask what the green stuff is and then ask for more of it before they have finished their first serving.
Why You’ll Love This Recipe
Seared tuna steak with chimichurri delivers over 45 grams of protein per serving in twenty minutes flat — start to finish. It needs one pan. It uses ingredients you can keep in your fridge and pantry permanently. The chimichurri keeps in the refrigerator for a week and makes everything it touches better — eggs, chicken, roasted vegetables, grilled bread. And the tuna itself is one of the most nutritionally complete proteins available: high in omega-3 fatty acids, vitamin D, B12 and selenium alongside that extraordinary protein content. This is the dinner that makes eating well feel effortless.
Ingredients
Serves 4
For the tuna:
- 4 tuna steaks, approximately 200g (7 oz) each, at least 2.5cm (1 inch) thick
- 2 tbsp (30ml) olive oil
- 1 tsp fine sea salt
- 1 tsp freshly cracked black pepper
- 1 tsp smoked paprika
- ½ tsp garlic powder
- Sesame seeds for crust (optional but recommended)
For the chimichurri:
- 60g (2 cups) fresh flat-leaf parsley, packed
- 15g (½ cup) fresh coriander (cilantro) — optional
- 6 garlic cloves, roughly chopped
- 3 tbsp (45ml) red wine vinegar
- 120ml (½ cup) extra virgin olive oil
- 1 tsp dried oregano
- 1 tsp chilli flakes (or 1 fresh red chilli, roughly chopped)
- ½ tsp fine sea salt
- ¼ tsp freshly cracked black pepper
For serving:
- 1 large avocado, sliced
- 200g (7 oz) cherry tomatoes, halved
- 100g (3.5 oz) rocket (arugula)
- Lemon wedges
- Flaky sea salt
Method
Step 1 — Make the chimichurri
Combine the parsley, coriander if using, garlic, red wine vinegar, dried oregano, chilli flakes, salt and pepper in a food processor. Pulse 8 to 10 times until roughly chopped — not smooth. You want texture, not a paste. With the processor running, drizzle in the olive oil until just combined. Taste and adjust salt, vinegar and heat. Transfer to a bowl and allow to sit for at least 15 minutes — the flavours develop significantly as it rests. Make it ahead if possible.
Step 2 — Prepare the tuna
Remove the tuna steaks from the refrigerator 10 minutes before cooking — cold tuna goes into a hot pan unevenly. Pat completely dry with paper towels — surface moisture prevents proper searing. Brush both sides with olive oil. Season generously with salt, pepper, smoked paprika and garlic powder. Press sesame seeds onto both flat sides if using — they create an extraordinary crust.
Step 3 — Sear the tuna
Heat a heavy skillet — cast iron is ideal — over the highest heat your stove produces. The pan must be smoking before the tuna goes in. No additional oil is needed. Place the tuna steaks in the pan and do not touch them for 90 seconds to 2 minutes until a deep golden-brown crust forms on the bottom. Flip once. Sear the second side for 60 to 90 seconds. The sides should still look raw. Remove immediately and rest for 1 minute on a board.
Step 4 — Slice and serve
Slice each tuna steak against the grain into 1cm slices — the pink interior should be revealed immediately. Arrange the rocket, cherry tomatoes and avocado on four plates. Fan the tuna slices over the top. Spoon chimichurri generously over the tuna. Add a squeeze of lemon. Finish with flaky sea salt.
Tips for the Perfect Seared Tuna Steak
The pan must be smoking. This is not the recipe to start with a warm pan. The crust on a seared tuna steak forms in the first 30 seconds of contact with the pan — if the pan is not hot enough when the tuna goes in, the crust never develops properly and the fish steams rather than sears. Get the pan properly smoking before anything goes in.
Buy thick steaks. Thin tuna steaks cook through too quickly — by the time the crust forms the interior is already overcooked. A minimum of 2.5cm (1 inch) thickness gives you enough time to develop the crust while keeping the centre rare.
Do not overcook. Tuna at medium-rare has a silky, rich interior that melts before the flavour hits. Tuna cooked all the way through is dry, grey and disappointing. 90 seconds per side for a 2.5cm steak produces a perfect medium-rare — the only correct temperature for tuna steak.
Make the chimichurri ahead. Chimichurri made 30 minutes ahead — or ideally the day before — is significantly better than freshly made. The garlic mellows, the herbs hydrate into the oil and the vinegar rounds out. Make it first and let it sit.
Variations Worth Trying
Asian sesame crust. Replace the smoked paprika and garlic powder with a mix of black and white sesame seeds pressed into both sides of the steak. Serve with a dipping sauce of soy sauce, fresh ginger, sesame oil and a drop of honey instead of the chimichurri.
Blackened tuna version. Combine smoked paprika, cayenne, onion powder, garlic powder, dried thyme and oregano into a blackening spice. Press onto both sides of the tuna and sear identically. Serve with a cool avocado lime crema instead of chimichurri.
Tuna steak tacos. Slice the seared tuna and serve in warm corn tortillas with chimichurri, sliced avocado, pickled red onion and shredded cabbage. One of the best tacos you will ever make.
Make-Ahead and Storage
The chimichurri keeps refrigerated in a sealed jar for up to 7 days — the flavour improves over the first 48 hours. Bring to room temperature and stir before serving. The tuna is best cooked fresh — seared tuna does not store well. Leftover cooked tuna can be refrigerated for up to 2 days and served cold over salad greens with extra chimichurri. Do not reheat — it will overcook.
What to Serve Alongside
Roasted baby potatoes with olive oil and rosemary alongside make the meal complete without adding complexity. A simple rocket salad dressed with lemon and olive oil is the classic accompaniment. Garlic butter roasted asparagus alongside adds colour and additional protein. Warm sourdough bread for chimichurri-mopping is not optional. A glass of crisp Sauvignon Blanc or Albariño alongside makes the whole thing feel like an occasion worth marking.
The Dinner Worth Twenty Minutes
Some recipes take all day and deliver exactly what you expected. This one takes twenty minutes and delivers something that makes you stop and think about what you are eating. The seared tuna steak with chimichurri is that dinner — the one that earns a permanent place in the weekly rotation immediately, that makes eating high protein feel like the best possible version of eating well, not the most restricted one.
Prep time: 10 minutes | Cook time: 6 minutes | Resting: 1 minute | Total: 17 minutes | Serves: 4
