Arguments marked with () brackets are optional. The {{{GUI-name}}} argument corresponds to the name displayed in the ingredient list in the recipe GUI. For vanilla ingredients, set the `display-name` argument to {{{.}}} to have no display name. The ingredient list should look like this in game:
There is one last option for MMOItems ingredients that is the item level. You can make it so MMOItems ingredients have a minimum level for recipes by adding `level=..` to your ingredient line config.