This slow baked salmon with lemon and onion features tender and silky salmon roasted at a low temperature and infused with the fragrance of lemon and herbs. It is a light and healthy way to enjoy this nutritious fish.
Massage the salmon fillets with olive oil and sprinkle salt and pepper generously over them. You may use ¾ - 1 teaspoon of salt per 1 lb of salmon. Set aside (it is best if you can give them time to become less cold).
Reserve a quarter of the lemon and thinly slice the remaining.
Spread a thin layer of onion slices in a baking dish to create a bed for the salmon to sit on. Place the salmon fillets on the onion bed, then scatter thyme leaves, lemon slices and the remaining onion slices on top of it. Squeeze the last lemon quarter all over.
Cover the baking dish and then put it into the oven. Bake for about 30-40 minutes (more or less depending on how thick your fillets are) until the internal temperature reaches 125℉-130℉ (52-54℃).
Remove from the oven and serve with more lemon wedges on the side if desired.
Notes
The thickest part of my salmon fillets is about 2-inch thick and it usually takes me 35-36 minutes to slow roast them.