01 - Combine blueberries, sugar, water, and lemon juice in a small saucepan. Simmer over medium heat, stirring occasionally, until berries burst and syrup slightly thickens, 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, mix ricotta cheese, milk, egg yolks, lemon zest, lemon juice, vanilla extract, and melted butter until smooth.
04 - Gently fold the wet ingredients into the dry mixture until just combined, avoiding overmixing.
05 - Whisk egg whites until soft peaks form, then carefully fold them into the batter to enhance fluffiness.
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 2 to 3 minutes until bubbles appear and edges are set, then flip and cook 1 to 2 minutes until golden and cooked through. Repeat with remaining batter.
07 - Plate pancakes warm and top with blueberry syrup.