In a nonstick skillet add all the ingredients except cornstarch and let cook on simmer. When it starts thickening and the blue berries turn soft and mushy add cornstaertch. Let cook for a few minutes until it reaches a jam consistency (it will thickens further when cool). turn heat off and let cool.
In a mixing bowl add the cream cheese,ricotta,castor sugar and lemon zest.Whisk until smooth and keep aside.
Unroll the crescent roll dough out of the box on to a slightly floured surface. Cut along the perforation to get 8 triangles.
On each triangle apply the cream cheese mixture.Then place a little jam on the cream cheese.Place the jam on the broadest part of the triangle.
Gently wrap the dough around the jam.Brush the rolls with egg white.
Line a baking pan with parchment paper. Gently place the rolls on it and bake in a preheated oven at 180 degree C for 15 -20 minutes until golden brown
Remove to a cooling rack and let cool for a few minutes. Serve warm or at room temperature.
