how do you soften cold hard hot dog buns?
Steaming is the difinative way.. if you have a confection oven or even a toaster just place on top and pre-set to desired softness (you do have to watch).. You can also use the microwave.. place in a microwaveable container wrapped in a cloth (like a cloth napkin) microwave on the shortest defrost cycle (you may have to repeat) they should come out nice, fluffy and soft (do not over cook as when they cool off they become tuff.. that's why you use the defrost cycle, under one pound.. about 30 seconds.. to prevent this from happening).
Mr. Bucket can help.
Of course, if you want to eat them, tell Mr. B to go away and take OF's advice. It works.
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