Grease pie plate, 9x1 1/4 inches. Mix cornmeal and cold water in 1-quart saucepan. Stir in boiling water and salt. Cook over medium-high heat, stirring constantly, until mixture thickens and boils; reduce heat. Cover and simmer 10 minutes, stirring occasionally; remove from heat. Stir in Parmesan cheese until smooth. Spread on bottom and up side of pie plate. Cover and refrigerate at least 4 hours until completely firm.