Here is a simple and delicious recipe for churros.
Please be extra careful with the ustensil you are using to made this ! If you are using a piping bag or a bad churros press, when you push the dough into the hot oil, it can explode and burn you! I recommend you to buy a good churros press, it doesn't cost that much !
I am using this tool: Churrera de Bernar (clic here).
Made with Cook Expert Magimix.
CHURROS 
250 g water
220 g flour
1 pinch of salt
1 teaspoon of lemon juice
Boil 1 liter of oil in a frying pan (arount 170°C)
Pour water into the Cook Expert stainless steel bowl
Run EXPERT / 5 min / SPEED 1A / 140°C 
Add flour, a pinch of salt and a teaspoon of lemon juice
Run EXPERT / 1min30 / SPEED 9 / 0°C 
Put the dough into a churros press
Squeeze 10 cm long churros in the frying pan (be extra careful with splashes!)
Once golden, remove the churros with a skimmer and drain on paper towels.
Sprinkle with powdered sugar and serve immediately.
You can also heat Nutella or Nocciolata in the microwave at minimum power.
How much butter is required please?
there is no butter 🙂 just flour and water
My bad, I thought I saw butter in the bowl. Thank you.