Marbled Pumpkin Cream Pie
["1 c. sugar", "1/4 c. cornstarch", "1/2 tsp. salt", "2 2/3 c. milk", "4 egg yolks, divided", "3/4 tsp. vanilla", "1 1/2 tsp. butter", "1 c. canned pumpkin", "1 tsp. cinnamon", "1/2 tsp. nutmeg", "1/2 tsp. ginger", "1/4 tsp. ground cloves", "1 (9-inch) baked pie shell"]
["In large saucepan, combine sugar, cornstarch and salt.", "Slowly stir in milk and cook.", "Stir constantly until thickened and bubbly.", "Remove 1 cup of the mixture and place it into another saucepan.", "Place 2 egg yolks into each of 2 small bowls.", "Beat lightly."]
["sugar", "cornstarch", "salt", "milk", "egg yolks", "vanilla", "butter", "pumpkin", "cinnamon", "nutmeg", "ginger", "ground cloves", "shell"]