In heavy 1 1/2-quart saucepan, combine 1/2 cup sugar and water; mix well. With pastry brush dipped in water, brush any sugar down sides of saucepan. Without stirring, cook over medium-high heat for 10 to 12 minutes or until mixture turns dark golden brown. (If sugar mixture is not cooking, gently swirl mixture in saucepan.) Remove from heat. While stirring constantly, add 1 tablespoon butter and whipping cream; stir until bubbling stops. Return saucepan to low heat; cook and stir until mixture is smooth.