Such bread, instead of being baked in the oven, is steamed for 3-1/2 hours. It may be made plain, according to the accompanying recipe, or, to give it variety, raisins or currants may be added to it. Boston brown bread may be steamed in an ordinary coffee can, such as is shown in Fig. 18, in a large baking-powder can, or in a can that is made especially for this purpose. A regular steaming can for Boston brown bread is, of course, very convenient, but the other cans mentioned are very satisfactory. A point to remember in the making of brown bread is that the time for steaming should never be decreased. Oversteaming will do no harm, but understeaming is liable to leave an unbaked place through the center of the loaf.