Sour Cream Lemon Pie

INGREDIENTS

• 1 cup white sugar
• 1/2 cup all-purpose flour
• 1/2 teaspoon salt
• 2 cups milk
• 1/2 cup sour cream
• 3 egg yolks
• 1/4 cup butter
• 1 1/2 teaspoons lemon zest
• 1/4 cup lemon juice
• 1 (9 inch) pie crust, baked