Preheat the oven to 400 degrees. Line some baking paper over a baking pan and set aside.
In a small saucepan, combine lemon juice with salt, egg yolks, lemon zest, and thyme. Add about three tablespoons of broth and briefly cook over medium heat – for 4 minutes.
Remove from the heat and slowly whisk in oil. Beat well until lightly thickened.
Generously brush the salmon fillets with the mixture and place into a baking pan. Pour in the remaining broth and bake for five minutes.
Now reduce the heat to 350 degrees and continue to bake for 10-12 minutes.