Due to the space limitations of a text message, please note that it is particularly important to read carefully, pay close attention to the context of the question, and use the answers as a springboard for further study.
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Q: Are there any requirements other than listening to the megillah reading on Purim night?
A: The night of Purim should have a festive atmosphere, and one should have a festive dinner by adding special food in honor of the holiday (but bread is not required like a typical Shabbat or holiday meal). In addition it is customary to eat legumes like beans and rice or seeds since that’s what Esther did to maintain observance of Kashrut while she lived in the palace of Achashveirosh. (S.A. 696)
Q: Is there a specific time of day that I am required to eat my daytime Purim seudah (festive meal)?
A: Beginning of Seudah: It is best to eat it in the afternoon, after one has already davened Mincha, but one may have it any time of day if necessary. End of Seudah: The majority of the meal should be finished before the end of the day. (S.A. 695)
Q: I have dairy silverware from my grandparents that hasn’t been used in about 50 years. Can I kasher it and use it for meat?
A: Normally to prevent confusion in the kitchen we customarily do not change the status of a utensil from meat to dairy or vice versa. In this situation it is permitted to kasher it from milchig (dairy) to fleishig (meat) (or vice versa) since it is more than year since it was used and since some opinions hold that all utensil absorption is diminished after that amount of time has elapsed and may be used for fleishig even without kashering.
Q: To you have to tovel (immerse in a mikvah) the cup of a new blender in the mikvah since the blade is metal?
A: Yes, since the blender is often used with food that is ready to eat.
Q: (I have a hunch about the answer to this but…) what happens if a fleishig glazed earthenware coffeee mug was placed in a dairy microwave to boil water for coffee and then milk was added while the contents were yad soledes bo (greater than 160 F)?
A: As long as the mug hasn’t been used in the last 24 hours and was clean, the coffee is permitted. Regarding the mug, earthenware cannot be kashered because it is assumed to be a one-way street – it absorbs but cannot be purged like metal and some other materials. Even though this mug is glazed, most authorities are nevertheless of the opinion that is no-longer kosher, since the glaze does not prevent milk absorption into the earthenware interior which would then become non-kosher when the two absorptions intermingle. If it is a special situation there is room to be lenient.
Q: Can you kasher Corelle?
A: Corelle is considered like any other glass: it cannot be kashered for Pesach, but it can be kashered if it becomes non-kosher.
Source: Rabbi Isaacs Blog