The Boston cooking-school cook book by Fannie Merritt Farmer

FRUITS: FRESH, PRESERVED, AND CANNED Fruits are usually at their best when served ripe and in season; however, a few cannot be taken in their raw state, and still others are rendered more easy of digestion by cooking. The methods employed are stewing and baking. Fruit should be cooked in earthen or granite ware utensils, and silver or wooden spoons should be employed for stirring. It must be remembered that all fruits contain one or more acids, and when exposed to air and brought in contact with an iron or tin surface, a poisonous compound may be formed. How to Prepare Strawberries for Serving