Adventive Solutions

There are the rebels who ignore food temperature altogether. They couldn't care less if their soup is lukewarm or their ice cream has started to melt. They can handle anything and will even eat leftovers that have been sitting in the fridge for days. We don't know how they do it, but their stomachs must have become immune to food temperature because it doesn't seem to affect them.

For everyone else there is.... Food thermometers

https://snafflestuff.com/blog/its-getting-hot-and-or-cold-in-here