01 - In a mixing bowl, beat the softened cream cheese, granulated sugar, egg yolk, vanilla extract, and lemon zest using an electric mixer or whisk until the mixture is smooth, creamy, and free of lumps.
02 - Lay one egg roll wrapper flat on a clean surface with one corner pointing toward you. Spoon 1 to 2 tablespoons of the cheesecake filling onto the wrapper, placing it near the corner closest to you.
03 - Fold the bottom corner up and over the filling. Fold in both side corners toward the center. Roll the wrapper tightly away from you. Seal the top corner with a small dab of the flour-and-water paste to hold the roll closed.
04 - Continue filling, rolling, and sealing the remaining wrappers until all 12 egg rolls are assembled. Keep completed rolls seam-side down on a sheet pan lined with parchment paper.
05 - Pour vegetable oil into a deep fryer or heavy-bottomed skillet to a depth of about 1 1/2 inches. Heat the oil to 350°F (180°C), using a thermometer to monitor the temperature.
06 - Carefully lower 3 to 4 egg rolls at a time into the hot oil. Fry for 2 to 3 minutes, turning occasionally, until the wrappers are golden brown and crispy on all sides.
07 - Using a slotted spoon, transfer the fried egg rolls to a plate lined with paper towels. Let them drain for 1 to 2 minutes to remove excess oil.
08 - Dust the warm egg rolls generously with powdered sugar. Serve immediately alongside fresh strawberries or berry compote, and drizzle with chocolate or caramel sauce if desired.