Slow Roasted Salmon with Lemon Butter Sauce

Slow roasting salmon is an easy and stress-free way to perfectly cook salmon for your whole family or even a crowd. This Lemon Slow Roasted Salmon with Lemon Butter Sauceis creamy, juicy, flavorful and PERFECT for brunch, lunch OR dinner! 

Slow Roasted Salmon is a simple but delicious way to prepare Salmon. 

What’s a dish that’s just as perfect for brunch, lunch OR dinner? This right here folks, this Slow Roasted Salmon served with a creamy Lemon Butter Sauce is as delicious as it is versatile!

Why you should be slow roasting Salmon!

Slow roasting salmon is a game changer. It’s my favorite way to eat salmon because the flesh is PERFECTLY cooked, it’s buttery and melt-in-your-mouth delicious, and so simple to cook. Plus, you can season and baste the salmon with your favorite seasonings or marinade.

How to serve Slow Roasted Salmon?

This slow roasted salmon is flavored simply with some melted butter (brown butter is even better!), lemon, salt and pepper. But the whole is so much greater than the sum of its parts in this dish, and the flavor of the salmon really comes to life. 

I can’t get enough of how amazing this simple dish tastes!

I serve this lemon slow roasted salmon with an easy sauce made with the same flavors that I added to the salmon. This creamy buttery lemon butter sauce has a nice lemony kick to it, and a good amount of garlic. The dish is served with a side of pan-fried asparagus, red onions and a spring salad. It’s a great spring-time dish, with some simple ingredients, but big, bold flavors.

Why I love slow roasted salmon!

Another reason why I love slow roasting salmon is because it’s the perfect way to cook salmon for a crowd. No longer do I have to pan fry salmon fillets one at a time and keep them warm till the rest are cooked. This way I can place all the salmon fillets in one sheet pan and cook them all together.

Here’s how I prep for this slow roasted salmon dish

I first start preparing the butter. I melt the butter (I actually make brown butter most of the time, but that’s optional). While the butter is melting, I prepare the salmon by pat drying it and cutting it into the sizes I want. I usually cut it into 3 ounce pieces for smaller portions/lighter meals, and about 5-6 ounce pieces if I want to serve this dish as a main. Then I brush the salmon fillets with the melted butter, and season them and let them marinate for about 30 minutes. While the salmon is marinating, I cut up all the vegetables and ingredients that I need. This includes chopping the garlic, shallots, red onion, asparagus and making sure the salad leaves are ready.

When the prepping is done, and the salmon is in the oven, it gives me just enough time to make the lemon butter sauce and to pan fry the asparagus.

That’s it! You can serve a family or a crowd with this delicious and impressive meal, and this way the buttery slow roasted salmon will be freshly cooked and warm, with minimal effort on your part.

If you’re still not convinced about slow roasting salmon, let me try one more time. Here’s why I think you HAVE to make this butter and lemon slow roasted salmon! 🙂

• The salmon is perfectly cooked. There’s really nothing better than soft, buttery, juicy salmon!
• The salmon cooks more evenly. Due to the low heat of the oven, the salmon cooks slowly and more evenly. While the edges might be SLIGHTLY more cooked than the middle, NO PART of the salmon is over-cooked or dry.
• This slow and low approach of cooking salmon is more flexible and more fool-proof, and is a very easy way to cook fish. Salmon (and other kinds of fish) are notorious for drying out quickly. While a pan-fried piece of salmon is so delicious, the high heat will either dry out the exterior and the edges of the salmon if it gets overcooked even slightly! But by slow roasting salmon, the salmon still tastes soft and juicy even if you end up overcooking it for 5 minutes! So it’s GREAT for beginners. 🙂
• You can flavor the salmon any way you want! Because of the low heat of the oven, the marinade and spices won’t burn. You can even add a glorious teriyaki glaze and the salmon will taste perfect with no burnt sugar bits or burnt garlic bits. But honestly, this simple lemon and butter marinade is my absolute favorite.
• This slow roasted salmon can be served hot, warm, at room temperature OR COLD! And it even tastes SO GOOD the next day with some eggs and toast like this egg in a hole recipe.

Convinced? Good.

How to check if the salmon is done?

If you have a food thermometer (or temperature probe), the salmon should be cooked to an internal temperature of 145°F (62°C). I ALWAYS use a food thermometer so that I get accurate results every time, but if you don’t have one, no worries. This salmon is completely cooked through without being the least bit dry. I have on occasion let this salmon cook to about 155-160°F, and it STILL tastes incredibly juicy. The only thing that you notice at that temperature is the white albumin that leaks out of the salmon. This is just coagulated protein, and while it’s totally harmless, it doesn’t look great. But between you and me, it that does happen, you can easily wipe it off, and no one will know. 😉

You can check the doneness of your salmon by inserting a fork or a thin knife into the salmon. If it goes in easily, then it’s ready. Another test is to gently press the top of the salmon, and if you feel like it’s just starting to flake, then it’s done. But the sure-fire way to get perfect, consistent results is with a temperature probe.

Can I still get crispy skin with this recipe?

If you are a crispy skin fan like me, you may start missing the crispy skin with this slow roasting technique. But there is a way to still get that delicious crispy skin if you really want to!

One option for that would be to sear the skin side on a very hot pan just before serving the salmon if you like.

Honestly though, this lemon slow roasted salmon is so buttery and flavorful, I never actually miss the crispy skin with this dish. BUT, leftovers are a different matter! With leftovers, I separate the flesh from the skin and serve the flesh separately (and cold). Then I pan fry the salmon skin until it’s crispy and then it’s shredded and added as a topping. 🙂

So if you’re still wondering about how to slow roast salmon, you should definitely give this butter lemon slow roasted salmon a try! It’ll change the way you cook salmon for a family. And after reading this post (and recipe) you will definitely learn how to make slow roasted salmon perfectly! Deliciously soft and juicy salmon with minimal stress and effort is something I can always get behind.

Other recipes you may like, 

Salmon Toasts

Fish cutlets (fish croquettes)

Crispy fish tacos with Roasted Grapes

EQUIPMENT & TOOLS I USED FOR THIS RECIPE

Half sheet pan – to roast the fish fillets. I do like to line the pan with parchment paper so that cleaning up will be easier.

Pastry brush – to brush on the butter on the Salmon fillets

Cooking thermometer to help check internal temperature