Crumble butter and flour with salt, possibly with a hand mixer.
Gather the dough with an egg and knead it smooth.
Let it rest in the fridge while you prepare the filling.
Fry the bacon until crispy in a pan and remove from the heat.
Slice the leeks and mushrooms and sauté them for 3-4 minutes in the pan.
Roll out your tart dough on a floured surface and place it in a tart tin.
Pre-bake it for 10 minutes.
Put your bacon/leek/mushroom mix in the tart.
Mix all ingredients for the egg mixture well and pour it into the tart.
Bake at 200 degrees Celsius (392 degrees Fahrenheit) for 25-30 minutes until the egg mixture is set and the tart is golden.
The raw salad is made by slicing carrots into thin sticks and tossing them in white balsamic vinegar, liquid honey, and a pinch of salt.