For the dough

1. Mix 1 tablespoon of flour, yeast, sugar and a tablespoon of lukewarm water together.
2. Set aside for 10 minutes, until bubbles appear.
3. Pour the rest of the flour, salt and the remaining water into the bowl of your stand mixer.
4. Mix for a minute (using the dough hook), then add the yeast.
5. Mix until the dough forms a ball.
6. Add the butter and mix until the butter is absorbed.
7. Cover with a clean dish towel and put in a lukewarm place.
8. Leave to rest for 4 hours.

For the topping

1. Remove the dough from the oven.
2. Remove the oven tray.
3. Preheat the oven to 482°F (250°C).
4. Roll the dough very thinly with a rolling pin.
5. Put the dough on the oven tray.
6. Mix the cream cheese, sour cream, salt and nutmeg in a bowl.
7. Spread the mixture onto the dough, to make the flammekueche base.
8. Heat a frying pan on high heat.
9. Add the lardons and onion and cook for 5 minutes.
10. Put the lardons and onion on the top of the flammekueche base.
11. Bake in the oven for 10 minutes.
12. Serve with arugula.