Can buttermilk be used in Yorkshire pudding?

No, buttermilk should not be used in Yorkshire pudding. Traditional Yorkshire pudding is made using plain milk, flour, and eggs. Butter or beef dripping is used to grease the tins to help the pudding rise and give it a crispy texture. Buttermilk is a fermented dairy product and its acidity could interfere with the raising agents in the batter and affect the texture of the pudding.