In a large bowl, combine egg yolks, ricotta cheese and melted butter.
In a separate bowl, combine flour, sugar, salt and lemon zest. Slowly add to ricotta mixture.
In another bowl, whip the egg whites until they form firm peaks. Fold the egg whites gently into the batter, until just combined.
Over medium heat, lightly butter a griddle or non-stick pan. Ladle in about 1/4 cup (60 ml) of batter to form small hot cakes and cook until golden brown on both sides.
Place 1 1/2 cups of blueberries in a small saucepan. Add water, sugar and vanilla. Heat over medium-high heat, stirring occasionally, until mixture comes to a low boil, sugar is dissolved, and blueberries just start to break apart.
Add dissolved cornstarch to saucepan and bring mixture to a rolling boil. Turn heat down and simmer on low heat for 2-3 minutes. If the sauce gets too thick, add a little bit of water, one tablespoon at a time.
Remove from heat. Add remaining blueberries and stir gently. Serve warm or cold.
Nutrients per Serving: Calories: 748 Fat: 42 g Saturated Fat: 24 g Trans Fat: 1.5 g Cholesterol: 401 mg Sodium: 693 mg Sugars: 51 g Fibre: 3 g Protein: 21 g Carbohydrate: 75 g