This baked steelhead trout fillet with garlic butter sauce is a tender, flaky fish recipe that can be whipped up in about 30 minutes.

If you like wild salmon, you are going to love steelhead trout! Steelhead trout is similar in taste to salmon but better. Steelhead trout is not the same as rainbow trout, just FYI.
Baked Steelhead Trout
Oh my god, the garlic lime butter sauce! Whenever I have dinner guests and very little time, I make this garlic butter steelhead trout recipe because it is quick, easy, and delicious. This is the best baked steelhead trout recipe, and my dinner guests would agree! I have never had a guest who didn't want to know how to make this recipe, it's that good.
Ingredient Notes
Steelhead trout: Buy fresh if possible with previously frozen as a second option. Additionally, I choose fish that's wild-caught instead of farm-raised. That's a personal choice, however, either type will work just fine. Steelhead trout looks like salmon and tastes very similar to salmon. You can substitute salmon for this recipe if you like. Also, I recommend buying fish fillets instead of whole trout. This cuts down on cooking time and makes eating it easier!

Mashed garlic: Fresh garlic takes on a different profile depending on how it's prepared. If you finely chop the garlic versus mashing the garlic, you will get different results. I prefer mashed garlic but minced garlic works too for the garlic butter sauce.
How To Roast Steelhead Trout

Preheat the oven to 425 ℉ (218 ℃). Peel and slice the onion. Slice 1.5 lemons, and save the other half to squeeze over the steelhead trout.

Add the sliced onions with olive oil to a baking dish or baking sheet. Lay the steelhead trout fillet on top skin side down. Squeeze fresh lemon juice (half of the lemon) on top of the steelhead trout.

Season trout with salt, black pepper, garlic granules, and dried Italian herbs. Lay the fresh lemon slices on top of the trout. Lemons keep the fish moist while it bakes.

Place trout on a middle oven rack for around 25 minutes or until cooked through. While the fish is baking in the oven, prepare the garlic lime butter sauce.
How To Make Garlic Lime Butter Sauce
Peel the garlic cloves. Using a mortar and pestle, mash the garlic cloves with a pinch of salt. Alternatively, use a garlic press or mince the garlic with a knife.
Cut the limes in half and juice using a lemon/lime squeezer. Melt butter on medium heat, then add the mashed garlic (or fresh minced garlic). Cook garlic until it gets golden brown while continuously stirring.

At the very end before taking the sauce off the stovetop, add the lime juice. Once the steelhead trout is finished baking spoon the lime garlic butter sauce on top.

Tips and Tricks
Don't skip the garlic lime butter sauce. I've made this delicious fish at least 50 or 60 times (it's that good), and the most important part is the garlic lime butter sauce.
Use parchment paper or aluminum foil for a quick cleanup.
Keep or remove the fish skin as you like. I bake this recipe with the fish skin intact, then remove it when eating.

Substitutions and Variations
My first preference for the fish used in this recipe is, of course, steelhead trout. If steelhead trout is not available, substitute salmon.
Add some sliced potatoes (or sweet potatoes) to the bottom of the pan for this to be a one-pan dinner. If using potatoes in this recipe, cook the onions and potatoes (without the fish) for about 10 minutes in the oven. The potatoes take a little longer to cook than the fish. You can also make roasted baby potatoes in a separate pan at the same time.
Make a lemon garlic butter sauce instead of a lime garlic butter sauce. Also, add some fresh herbs to the garlic butter sauce, like rosemary, oregano, or thyme.
Serve with a bright chopped salad like shirazi salad or vermicelli rice. A great appetizer is Italian fried calamari or steamed shrimp cocktail.
📋 Recipe

Baked Steelhead Trout with Garlic Butter Sauce
Ingredients
Steelhead Trout
- 1½ lbs steelhead trout fillet
- 1 onion
- 2 tbs olive oil
- 2 lemons
- salt and pepper to taste
- ½ tbs Italian herb seasoning
- 1 teaspoon dried garlic granules
Garlic Lime Butter Sauce
- 4 tbs butter
- 6 garlic cloves
- 1 lime
- pinch of salt
Instructions
Steelhead Trout Recipe
- Heat oven to 425 ℉ (218 ℃).
- Peel and cut an onion into slices. Put some olive oil with onions in a baking dish.
- Place fish on top of the onions. Squeeze half a lemon over fish. Season with salt, pepper, and any other dry ingredient you fancy.
- Slice the rest of the lemons thinly. Place the thinly sliced lemons over the top of fish.
- Bake for about 25 minutes or until the fish is cooked through (depends on the thickness and size of fish).
- Roast some veggies in a second pan if you like- it's about the same cooking time.
Garlic Lime Butter
- Mash 6 large cloves of garlic with some salt using a mortar and pestle. Alternatively, mince the garlic finely.
- Add butter to the pan (roughly 4 tablespoons).
- Add the mashed garlic to the butter and cook on medium-high until garlic starts to turn golden.
- Squeeze the juice from 1 whole lime to the sauce. Stir, take off the heat.
- Spoon the sauce over the steelhead trout once the fish is out of the oven.
Notes
- Sometimes I peel and slice a potato to go under the fish. If adding potato, put the onion and potato in the oven without the fish for about 10 minutes. Then, continue with baking the fish.
- Storage: Store trout in the fridge for 2 to 3 days in an airtight container. Leftover steelhead trout is great atop a bed of greens or vermicelli rice.












David N says
This came out great. Taste with the garlic lime sauce is fantastic. We served it with white rice and roasted baby bok choy. I will make this again and again.
Lily Guidry says
Thanks for taking the time to comment David! So glad you enjoyed the garlic lime butter sauce- it's so simple yet so good.
RITA O'KELLEY STONE says
My first time, at 69, to prepare Steelhead Trout. We regularly eat Atlantic Salmon. This is our new favorite. I also put asparagus in the pan and it all turned out perfectly.
Lilian Guidry says
Thanks Rita! So glad you liked this recipe- it’s one of my favorite ways to roast fish in the oven.
Karen says
Super reluctant when my husband picked up steelhead from the store recently then found this recipe! So flavorful and easy and so great! Going to try with salmon too. Thank you!
Lily says
Hi Karen! Thanks for the comment. It’s a great way to prepare salmon too!
judy says
excellent recipe
Lily says
Thanks for the comment!
J.Brock says
Excellent recipe ! I sometimes use orange slices below the fish to prevent sticking to the baking dish & on the fish for the flavor.
Lily says
I’ll try oranges next time, those sound great!
Diane says
I have now made the steelhead trout recipes four times. I just love it. Who would have thought baking fish on onions would taste sooo good. I do love onions. Thank you for your creativity.
Lily says
Yay! This recipes is one of my favorites, especially for busy weeknights. Sometimes I roast baby butter potatoes on a second sheet pan at the same time. The potatoes are on the blog if you search baby gold potatoes.
Diane says
Made this last night for my family. Excellent recipe. I added mushrooms to the onions because we love them. The lime butter garlic sauce is a must; it pumps the flavor up a couple of notches. Easy to put together and even easier to enjoy. Thanks so much!
Lily says
Hi Diane, Thank you so much for the comment! The lime garlic butter sauce is my FAVE with this fish! So glad you and your family enjoyed the recipe.
Patricia says
Valuable info. Lucky me I found your website by accident, and I'm shocked why this accident didn't happened earlier! I bookmarked it.
Steven Steven says
I think it's worth mentioning that you should use a skinless filet of fish in this recipe.
Lily says
Hi Steven, thanks for the comment! That's a great point, feel free to use a skinless fish for this recipe. I might be weird, but I make it with the skin on 😳. I ran into issues with the skin on in one scenario: if I roasted the onions first before putting the fish on top. The skin will stick in that case to the onions. Also, I don't eat the skin. The fish easily peels away from it. I think it's easy to get the fish skinless though if that's bothersome.
Christina says
Loved it!!!
Kat says
This was really good- I appreciate the recipe!
Stan L. says
Yum
Lilian B. says
Thanks Stan for your review!
S. Gabar says
First time to try steelhead trout and it was really so good. I added some olive oil to the top before baking. Ate it With roasted potatoes- heavenly.
Lilian B. says
S. Gabar- I appreciate your review!