Usually it's 'sandwich' (plural - les sandwichs) but a ham sandwich is also called 'un jambon beurre'.
It is masculin "Un sandwich". Most foreign (to France) words are masculin :Un short, un parking, le shopping, le shampooing....
Masculine.
Sandwich in English = Sandwich in French
A ham sandwich is "un sandwich au jambon" in French.
A wholegrain bread sandwich is 'un sandwich au pain complet' in French.
Un sandwich.
There is no specific French word for sandwich, so it is spelled the same.
Un sandwich is a masculine noun in French.
A lettuce sandwich is "un sandwich à la laitue" in French. You would rather ask for "un sandwich à la salade".
sandwich pronoused saandwish
sandwich de héros
sandwich de saucisse
The word for grilled in french is grillé. Pain grillé is toast. Un sandwich grillé would be a grilled sandwich.
sandwich au poisson