Find out which reader to use from the satpy reader table on this page: https://satpy.readthedocs.io/en/latest/index.html
Then create a True Color composite from it.
Find out which reader to use from the satpy reader table on this page: https://satpy.readthedocs.io/en/latest/index.html
Then create a Overview Sun composite from it.
Choose a nice colormap and colorize the SLSTR thermal channel at ~11µm
Combine the results exercices 1 and 3 to create a sandwich composite