Heat oven to 300 degrees. Season salmon with salt and pepper on both sides. Place in a large baking dish with sliced lemons, orange and thyme (or rosemary, oregano or marjoram), if using.
Step 2
Drizzle everything with olive oil and bake until salmon is just turning opaque at the edges and is nearly cooked through, 25 to 35 minutes.
Step 3
Toss fresh herbs with 1 tablespoon lemon juice and flaky salt. Serve alongside salmon.