This article explains how to make homemade butter using only one ingredient. The process involves placing heavy cream in a jar and shaking it vigorously until the cream turns into butter. The article highlights that homemade butter is not only easy to make but also healthier and more flavorful than store-bought versions. The author suggests adding salt or other seasonings to enhance the taste. Overall, the article provides a simple method for creating delicious butter at home with minimal effort.