Learn how to reheat tempura here–
First, don’t try to reheat tempura that didn’t taste good the first time around. Poorly prepared tempura doesn’t get better by reheating, neither does improperly stored tempura.
So, start by storing your room-temperature tempura in an air-tight container. Make sure the tempura pieces do not touch. If you are stacking several layers of tempura, separate each layer with a sheet of parchment or wax paper.
Please note that parchment paper is non stick, water resistant and heat resistant whereas wax paper is both non stick and water resistant, but not heat resistant. So, don’t get the wax paper anywhere near a heat source, or it may likely melt or even catch on fire if the temperature is high enough.
Store your separated and stacked tempura in the refrigerator until you are ready to reheat it. Do not store it for more than two to three days as the flavor and texture will decline over time.
When you’re ready to reheat your tempura, remove it from the refrigerator and allow it to come to room temperature while the oven preheats.
You’ll want to preheat the oven to 375 – 425 degrees Fahrenheit. Place the pieces of tempura on a non-stick or parchment-lined baking sheet so that they are in a single layer and not touching. Place the baking sheet in the preheated oven for 3 – 5 minutes.
Then, remove the baking sheet from the oven and flip each piece of tempura. Return the baking sheet to the oven for another 3 – 5 minutes or until the desired level of crispiness has been achieved.
Watch for deepening color and do not allow the tempura to burn or get too dark. This will make the tempura taste bitter.
You may also use a toaster oven to reheat leftover tempura. Set the toaster oven to medium high. Arrange the tempura in a single, non-touching layer on a parchment-lined oven pan.
Place the pan in the toaster oven for 6 – 12 minutes or until crispy. Do not leave the toasting tempura unattended, because the high oil content of the tempura makes it susceptible to a flare up inside the toaster oven.
Once you’ve removed the crisp tempura from the oven, place the pieces on paper towels to soak up any excess oil. Season to taste, if necessary. And serve immediately.
Another way to reheat leftover tempura is to deep fry it in oil for a minute or two or until crispy. The oil should be between 350 and 375 degrees Fahrenheit.
Do not overcrowd the fryer with tempura, as this will cause the temperature of the oil to drop too low and result in soggy, oily tempura.
So, these are a few ways of how to reheat tempura so that it is as enjoyable the second time around.