possible to choose more than one value for the same option?

[Edze]

Hi,
Trying to build a shop for sandwiches, each with more than one dressing (or none), like:
mayonnaise, curry, mustard
How can I make a list (multiple choice list?) where the customer can choose for example: curry and mustard, instead of making the option Yes and No for each type of dressing.
We have about 80 types of sandwiches and 15 types of dressings.

Kind regards,
Edze