Before baking:
For the buns , see bread recipe, only instead of all purpose flour 100%, put 50 % all purpose flour and for the remaining 50% use whole wheat flour
For the tenderloin :
Take 1 piece of whole tenderloin from your butcher , he will cut for you only the fats and then you cut the meat with a sharp knife in thin pieces , see photo. The marinate with herbs ( 1 teaspoon sage , 1/2 teaspoon thyme , 1/2 teaspoon rosemary , 1 chopped dry onion , 2 Tbsp extra virgin olive oil, 1-2 Tablespoon of mustard (not powder ), 1 pinch of sea salt , 1 pinch of pepper , optionally 1 clove of garlic .
In a sprayed pyrex with extra virgin olive oil cut 2-3 potatoes and above them put the marinated meat , bake at 200 degrees in a preheated oven(not fan), in the middle rack, for 20-30 minutes and Bon Appetite !