In a large glass bowl, whisk together confectioners’ sugar, ½ cup water, corn syrup, and lemon extract. Microwave on high in 30-second intervals until smooth. Add white chocolate chips; stir until melted. Microwave in 10-second intervals, if needed, to fully melt chocolate. Whisk in food coloring. Before being poured, the glaze will need to be stirred again, as it can form a thin crust very quickly.