Pistachio Cake from Scratch Recipe - Food.com

Ingredients

• 6 large egg yolks, lightly beaten
• 2/3 cup sour cream
• 1 teaspoon pure vanilla extract
• 1 2/3 cups sifted cake flour
• 1/3 cup finely ground roasted pistachios
• 1 cup superfine sugar
• 1 (3 1/2 ounce) package Jell-O instant pistachio pudding mix
• 1/2 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt (omit if using salted nuts)
• 12 tablespoons unsalted butter, softened to a cool room temperature
• 1 tablespoon walnut oil or 1 tablespoon olive oil