In medium saucepan, place egg yolks; beat with whisk or fork to blend. Stir in 1 cup sugar. Add cornstarch and salt; mix well. Stir in 1 1/4 cups milk, the evaporated milk and 1 1/2 teaspoons vanilla until blended. Stir in butter. Cook over medium heat, stirring constantly, until thick and bubbly. Spread pears in cooled baked shell. Spread cream filling over pears. Carefully slide lattice top onto pie. Cool; refrigerate 4 hours or until filling is set.