The term FITTING COFFEE ORDER ON A SUBMARINE can be solved by the five-letter word SANKA. Sanka is a brand of decaffeinated COFFEE that was first introduced in the United States in 1903. It is made from a blend of COFFEE beans that have been decaffeinated using a process called indirect solvent extraction. This process removes the caffeine from the beans without affecting the flavor or aroma of the COFFEE. Sanka is often used in submarines, as it is a convenient way to provide COFFEE without the need for a large amount of caffeine.