The object of "Is It A Sandwich?" is to just sort of have a conversation.
Decide who goes first or just start talking.
A player proposes a candidate. Every player begins discussing whether or not that candidate is a sandwich. After some debate, players make a judgment that Yes the candidate is a sandwich or No, it is not a sandwich. Players are allowed to change their mind as debate unfolds. The round ends when a player proposes a new candidate to debate.
(Note: although the round ends when someone proposes a new candidate, players may revisit the candidates from previous rounds at any point to reopen debate or change their judgment.)
The game ends when the food arrives. There is no winner. There are no losers.