First prepare the parchment paper rings, about 3 inch (8cm) wide and 1 ½ inch (4cm) high. Bind the ends of the parchment paper with a bit of butter.
Separate whites from yolks.
Add milk and vanilla extract over the egg yolks and whisk slightly to combine. Sift flour and baking powder and mix to incorporate and set aside to whip the whites.
Add salt over the whites and start whipping until foamy. Add lemon juice and gradually incorporate sugar.
Continue whipping until stiff peaks form.
Place a large nonstick skillet over medium-low heat.
Gently fold the whites into the yolk mixture.
Slightly grease the pan with vegetable oil and place the rings in the pan.
Divide batter evenly.
Pour about 1 tablespoon of water to create steam, cover and cook the pancakes for about 6-8 minutes.
Gently flip the pancakes, add another tablespoon of water if evaporated, cover and cook for another 5-6 minutes.
Gently remove the parchment paper and transfer pancakes to a serving platter.
Serve imediately, dusted with powdered sugar or maple syrup and fresh berries. The pancakes may deflate slightly after cooking. Enjoy!