Now we need to add the flour, again a little at a time.
I like to just add a spoonful first, and then gently cut that in with a metal spoon, to loosen the mixture. Then add about half of the rest of the flour, mix, and the remaining flour.
You don't want to beat the mixture at this point, just fold the flour in by cutting through the mixture from one side to the other with the edge of the metal spoon, and then bring it back to the starting point turning it over as you go.
Move the bowl round a little and repeat.