Add yolks and whites in two large clean bowls.
Add milk, corn oil, and vanilla extract to the yolks and whisk until smooth.
Sift in cake flour and baking soda, then gently fold with a spatula until just combined. Do not overmix. Set aside.
Add sugar and lemon juice to the egg whites.
Beat on high speed for 2–3 minutes, then reduce to medium. Continue whipping until stiff peaks form.
Fold one-third of the meringue into the yolk mixture.
Pour the yolk mixture back into the remaining egg whites and fold gently until fully combined, scraping from the bottom.
Transfer the batter into a piping bag.
Heat a non-stick pan over low heat and lightly oil it.
Line two round ring moulds (Diameter: 3.5 inch/9cm; Height: 1.2 inch/3 cm) with baking paper. Depending on the size of your pan. If you’re using a larger or wide flat pan, you can cook multiple soufflé pancakes in one batch.
Pipe batter into the mould until ¾ full.
Add ½ tbsp water into the pan (not on the batter). Cover with a lid and cook on low heat for 7 minutes.
Flip the soufflé gently, add another ½ tablespoon of water, cover again, and cook for another 7 minutes.
Remove from the pan and peel off the baking paper.
Repeat with the remaining batter.
Garnish as desired. See list in notes for suggestions.