Food experts were constantly busy devising the best means of preserving the food until it reached the army kitchens, whether in the home camps or behind the lines at the front. A part of their mission was also to eliminate waste. Coffee roasting plants were installed in all the large camps at home and overseas, for the double purpose of giving the soldier better coffee--coffee made within twenty-four hours after the bean had been roasted--and to prevent the waste, about two cents on each pound, which results when the roasted coffee is kept for long periods and so deteriorates in strength and quality. A school was established to which men were sent to learn the art of roasting coffee properly and after they became expert they were detailed to the different camps at home and abroad to take charge of the coffee roasting plants. Lemon drops were found to be a desirable part of the army ration, as they supply needed factors of food, help to quench thirst and are much enjoyed by the soldiers. To make sure that the drops supplied should be of the best quality a formula was prepared calling for pure granulated sugar and the best quality of fruit and the candy makers taking the contract were held strictly to that standard. The same care was taken to see that manufacturers of chocolate candies should use the best cocoa beans in making them. The candy ration for troops on overseas service was a half pound every ten days for each soldier, and a great deal of this was made, toward the end of the war, in factories which the Quartermasters Corps established in France.