In a large bowl, mix together oil, vinegar, mustard, thyme, sprigs of rosemary, bay leaf, smashed garlic, and honey. Add meat to bowl, cover with plastic wrap, and marinate in refrigerator for 1 hour or up to one day. Optional: Bring tenderloin up to room temperature before baking.
In a large bowl, mix together oil, vinegar, mustard, thyme, sprigs of rosemary, bay leaf, smashed garlic, and honey. Add meat to bowl, cover with plastic wrap, and marinate in refrigerator for 1 hour or up to one day. Optional: Bring tenderloin up to room temperature before baking.
Roast until cooked to your liking, about 20 minutes for rare. Let rest 5 to 10 minutes before slicing.
Meanwhile, make sauce: In a medium bowl, whisk together yogurt, sour cream, horseradish, and lemon juice, and season with salt.
Slice tenderloin and serve with sauce on the side.