the easiest way is to take a kraft paper bag, soak it in water, then put the bread in the bag and heat it in the oven or microwave oven. The more troublesome way is to put about 5 ml of vinegar in 5 ml of warm water, put an appropriate amount of bread slices on the steamer, cover the lid and let it stand for 3 minutes. The principle is that acetic acid can neutralize the baking soda in bread.

When the bread is hard, it can be softened by steaming. Put the hard bread in a steamer and steam for 5 to 8 minutes, and the bread will be softened. Remember to cover the bread with a piece of tin foil to prevent the water on the steamer cover from dripping and wetting the bread.