01 - Combine blueberries, sugar, water, and lemon juice in a small saucepan. Simmer over medium heat, stirring occasionally, until berries burst and syrup thickens slightly, about 8 to 10 minutes. Remove from heat and set aside.
02 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl until evenly combined.
03 - In a separate bowl, blend ricotta, milk, egg yolks, lemon zest, lemon juice, vanilla extract, and melted butter until smooth.
04 - Add wet mixture to dry ingredients and gently stir until just combined, taking care not to overmix.
05 - Beat egg whites in a clean bowl until soft peaks form. Fold gently into batter until incorporated to create a light, fluffy texture.
06 - Heat a nonstick skillet or griddle over medium heat and lightly brush with butter. Pour 1/4 cup batter per pancake onto the skillet. Cook until bubbles appear and edges are set, 2 to 3 minutes. Flip and cook an additional 1 to 2 minutes until golden and cooked through. Repeat with remaining batter.
07 - Plate pancakes warm and top generously with the prepared blueberry syrup.