Place the flour in the bowl of a stand mixer.
Make a well in the centre and pour in the hot water with the salt.
Using a stand mixer with the hook attachment, knead until soft ball forms, for about 8 minutes.
Transfer the dough onto a work surface and continue kneading by hand for about a minute while shaping the dough into a round, smooth ball.
When you're finished kneading, cover the dough with cling wrap or a damp kitchen towel and let it rest for 30 minutes at room temperature.
The resting time relaxes the gluten in the dough and makes it easier to roll and shape.
Sprinkle a rimmed baking sheet with some flour and set aside.
Cut the dough into 8 pieces.
Working with one piece at a time, while keeping the remaining dough covered, roll the piece out into a pencil-thin rope about 1 cm in diameter.
Cut the rope into 2-centimetre pieces.
Use a gnocchi board, if you have one, to make the little caves or indentations in the dough.
If you don't have a gnocchi board, use your index and middle fingers to press down into the dough and swiping towards you. This will create the distinctive crevice.
Transfer the cavatell to your prepared baking sheet and repeat with the remaining pieces of dough.