Mix all ingredients for marinade numer 1 in a bowl.
Put the beef tenderloin in a plastic bag and add the marinade to the bag. Make sure the marinade coveres all parts of the beef. Let it rest in the fridge for at least 5 hours, but preferably over night.
When the beef is done marinating preheat the oven to 150 degrees Celcius.
Preheat a pan over medium heat and fry the beef for 2-3 minutes on each side.
Put the beef in an oven safe baking pan and bake until the inner temperature reaches 50-55 degrees (depending on how raw you prefer your beef). I recommend you to use a termometer to get the temperature right.
When the beef is done in the oven wrap in aluminium foil and put in the fridge for it to rest for 20-30 minutes.
Meanwhile prepare marinate number 2.
When the beef is done resting take out of the fridge, slice into 1 cm thick slices. Put in a baking pan and cover with marinade number 2. Let it rest in the fridge until serving.
Take out of the fridge 15 minutes before serving it.