and add the flour all at once. stir with a wooden spoon until the dough comes together to form a ball. place the pan over medium heat and beat constantly until the dough pulls away from the sides of the pan, about 4 minutes. do not let it burn. a film may form on the bottom of the pan.
put the dough in an electric mixer fitted with a paddle attachment. add the eggs 1 at a time, beating well after each addition. scrape down the sides of the bowl and continue to beat the dough for 4 minutes at high speed. feel the dough: it should be sticky at first 