sand·wich (sānd'wĭch, sān'-) Pronunciation Key
n.

1.
1. Two or more slices of bread with a filling such as meat or cheese placed between them.
2. A partly split long or round roll containing a filling.
3. One slice of bread covered with a filling.
2. Something resembling a sandwich.

None are correct. Nothing there is required to make a sandwich. You can find this definition at dictionary.com