San Francisco ice cream parlor The Castro Fountain, featured in our July/August 2024 issue, serves up an irresistible selection of milkshakes made with housemade ingredients, including ice cream, sauces, and candy. But for a DIY-friendly version of its salted caramel turtle pecan milkshake, which is usually made with the shop's own salted caramel turtle pecan ice cream, owner and milkshake creator Juliet Pries simplified the menu with a store-bought vanilla ice cream and the option to use a commercial caramel sauce. Just be sure to use ice-cold milk, which "will result in a thicker, colder milkshake because it slows down melting of the ice cream during the mixing process," says Pries. "It's a small detail, but it makes a noticeable difference in the finished milkshake."