Place a large bowl and strainer on heatproof surface near stove. Combine milk and yolks in a heavy, nonstick, medium-size saucepan. Stir in remaining 1 cup sugar. Cook over medium-low heat, stirring constantly with rubber scraper, until instant-read thermometer just reaches 190 degree F, about 15 to 20 minutes (do not let boil), or until slightly thickened. Strain immediately into bowl; stir in salt.