To make sandwiches, first you must purchase the Sandwich Prep Table from the Saloon (or you can use a mod like CJB Item Spawner to cheat one in). Once you have it, all you need to do is place a bread, followed by toppings (all edible items are accepted), and finally top it off with another bread.
When eaten, sandwiches give you the effects of all the toppings. 
If sandwich is uninstalled, then Sandwiches and the Sandwich Prep Table will convert into Error Items. 
This mod currently does not have any config options. 
See here for the current status on translations.
Feel free to visit me on my Discord server for announcements and early access to beta releases of my mods.
You're also welcome to seek support or submit issues there. You can also find me on the Stardew Valley discord in #making-mods (LeFauxMatt).
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