01 -
Measure all items accurately and put them within reach. Mix the cake flour and salt together after sifting. Take some kitchen paper to lightly grease your pan, then start warming it on low heat.
02 -
Put the lemon juice in with your egg whites and beat until you see bubbles. Pour in half the sugar and keep beating till you get soft peaks, then add the rest of the sugar and continue till stiff peaks show up - your whisk should leave a point that doesn't flop over.
03 -
Stir in cornstarch till it's smooth, then mix in egg yolks roughly so they're only half combined. Add your flour mix gently, folding until you can't see any dry spots. Lastly, fold in the milk just enough to blend, and right away pour it into a piping bag.
04 -
Squeeze about half your batter onto the warm pan, making 4 tall dollops. Sprinkle in half a tablespoon of water, put the lid on, and let cook for 3 minutes. Top each with more batter, add a few water drops around the pan, cover again and wait 4 minutes. When the bottom edges feel dry, carefully flip them over, add more water, cover and cook 4 more minutes until they bounce back when touched.