First of all sift the flour and salt into a large mixing bowl with the sieve held high above the bowl so the flour gets an airing. Now make a well in the centre of the flour and break the eggs into it. Then begin whisking the eggs using an electric whisk or a balloon whisk – incorporating any bits of flour from around the edge of the bowl as you do so. When the mixture starts thicken, gradually add small quantities of the milk and water mixture, still whisking (don't worry about any lumps as they will eventually disappear as you whisk). When all the liquid has been added, use a rubber spatula to scrape any elusive bits of flour from around the edge into the centre, then whisk once more until the batter is smooth, with the consistency of thin cream. Now melt the butter in the pan. Spoon 2 tablespoons of it into the batter and whisk it in, then pour the rest into a bowl and use it when needed to lubricate the pan, using a wodge of kitchen paper to smear it round.
