In a large mixing bowl, whisk together the flour, sugar, baking powder, lemon zest, and a pinch of salt.
In a separate bowl, whisk the eggs, then add the milk, melted butter, lemon juice, and vanilla extract.
Pour the wet ingredients into the dry ingredients and whisk until just combined and the batter is smooth.
Preheat your waffle iron to medium heat and lightly grease it with butter or oil.
Pour a portion of the batter onto the center of the waffle iron (about one ladleful), close the lid, and cook until golden brown, approximately 3-4 minutes.
Once cooked, carefully remove the waffle with a spatula and place it on a wire rack to cool slightly and maintain crispness.
Serve fresh with powdered sugar, lemon curd, or fresh fruit.
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