In a mixing bowl, whisk together flour, sugar, and salt.
In another bowl, whisk together milk, eggs, and melted butter.
Gradually add the wet ingredients to the dry ingredients, whisking until smooth.
Heat a non-stick pan over medium heat and lightly grease with butter.
Pour ¼ cup of batter into the pan, swirling to coat the bottom evenly. Cook until edges start to lift, then flip and cook the other side. Repeat with remaining batter.
In a bowl, mix ricotta, lemon juice, lemon zest, honey, and vanilla extract until smooth.
Fill each crepe with a spoonful of the lemon ricotta mixture, fold, and serve.