Boiled peanuts are a snack food that is well-known in the southern United States but hard to find in other regions. They are made by boiling fresh peanuts for several hours in salty water. Various recipes call for adding other seasonings or chicken broth as well. They are best eaten immediately, while still warm, and have a completely different texture than roasted peanuts. If you have some leftover, or if you purchased them via mail order, you can reheat them in the microwave to simulate just-cooked boiled peanuts.
Pierce the bag if the peanuts are in an unopened plastic bag. Or place the peanuts in a microwave-safe container and cover it.
Microwave peanuts for one minute.
Test to see if they are hot by holding your hand above them. Shake the bag, or stir the peanuts, and microwave for 20 seconds more, if they are not all hot. Continue microwaving and testing until they are hot. The time required will depend on the quantity of the peanuts and the power wattage of the microwave.
Another reheating method is to heat them in boiled water for five minutes. You can add one or two tablespoons of salt to the water if desired, to make the peanuts saltier.
Boiling fresh peanuts "from scratch" (starting with fresh peanuts) is a process that takes several hours and is best done on the stove, since the electricity needed to run a microwave for that length of time is much greater than the energy to run an electric or gas stove burner for that length of time.