While the inns in Harry Potter Wizards Unite look like Pokemon GO's Pokestops, their functionality is totally different. Indeed, an inn will allow you to recover the energy necessary to cast spells. And the spells, you need them to capture Foundables!
A inn can be activated every 5 minutes. A meal tray is then randomly offered to you, note that there are several colors of inns. Depending on the color, the dishes offered are more or less energy-rich.
Blue inns: between 2 and 10 energy per dish
Pink inns: between 2 and 6 energy per dish
Brown inns: between 1 and 6 energy per dish
Green inns: between 2 and 6 energy per dish
Purple inns: between 1 and 7 energy per dish
Here are the dishes they can contain, and the number of energy granted:
Written by Camille "Milkameluna" Chabroud. Translated from French by Millenium.us.org.