Rocky road ice cream is a chocolate flavored ice cream. Though there are variations from the original flavor, it is traditionally composed of chocolate ice cream, nuts, and whole or diced marshmallows. According to one source, the flavor was created in March 1929 by William Dreyer in Oakland, California when he cut up walnuts and marshmallows with his wife's sewing scissors and added them to his chocolate ice cream in a manner that reflected how his partner Joseph Edy's chocolate candy creation incorporated walnuts and marshmallow pieces. Alternatively, Fentons Creamery in Oakland claims that William Dreyer based his recipe on a Rocky Road-style ice cream flavor invented by his friend, Fentons' George Farren, who blended his own Rocky Road-style candy bar into ice cream; however, Dreyer substituted almonds for walnuts. The original Rocky Road ice cream used chocolate ice cream with no chocolate chip pieces. By blending numerous ingredients such as chocolate ice cream, nuts, and marshmallows, the rocky road flavor was one of the first types to mix in the materials together. This was only made possible by the revolutionary powers of refrigeration. This style was developed by Dreyer's lead chemical engineer and dairy chef Noah Holladay and proved difficult to produce due to the nature of freezing and preserving various mixed ingredients. Over the years after the inception on the flavor, many companies would try to imitate or mix in other ingredients such as various nuts, fruits, and toppings, but the original combination proved to be the most popular.