Instead of adding chocolate chips to the ice cream, Graeter's devised a technique to add melted chocolate mixed with a small amount of vegetable oil near the end of the stirring process, which results in chocolate chunks of different sizes. According to the company's recollections, this technique was created when a young Wilmer Graeter stole chocolate and poured it into a pot of ice cream. For a time, it also molded ice cream into different shapes to serve. These chocolate chips were incorporated into a number of flavors to great success, and by 2010 chocolate chip ice cream flavors accounted for 70 percent of its sales. A bittersweet Hershey-based fudge sauce was created before World War II for use in sundaes, and the company later shifted to using a chocolate from a Nestlé spinoff company. It added parfaits, milkshakes and sodas as well over time. Later, it also introduced gelato, sorbet, and low-glycemic desserts. Dick Graeter first created a Black Raspberry flavor, and around the 1970s began adding chocolate chips. For a time it sold both varieties but discontinued the first version after the second was more successful. This flavor has since become the best-selling flavor in the chain, accounting for 20 percent of its overall sales by 2010. He also launched a program for seasonal flavors of ice cream, notably beginning with a coconut variety in January, cherry chocolate chip in February, chocolate almond in March and so on. After a time, it instead offered "seasonal" flavors for up to three months at a time, with favorites including strawberry chocolate chip in the springtime, or peppermint or eggnog around the end of the wintertime.