01 - Combine ricotta, sugar, lemon zest, lemon juice, vanilla, and salt in a mixing bowl. Beat until completely smooth and creamy.
02 - Whip heavy cream in a separate bowl until stiff peaks form. Gently fold whipped cream into the ricotta mixture until fully incorporated and uniform.
03 - Transfer lemon cream filling to a piping bag. Pipe filling evenly into both ends of each cannoli shell, ensuring shells are completely filled.
04 - Beat egg whites and cream of tartar with electric mixer until soft peaks form. Gradually add sugar while beating, continuing until stiff, glossy peaks form. Fold in vanilla extract.
05 - Spoon or pipe meringue onto the filled ends of each cannoli, covering the exposed cream filling completely.
06 - Use kitchen torch to lightly toast meringue until golden brown. Alternative: place cannoli on baking sheet and broil for 1-2 minutes, watching closely to prevent burning.
07 - Serve right away for optimal texture and shell crispness. Filling causes shells to soften over time.