Okay, smørbrød is both singular and plural. and because a number is not specified then you assume that it's plural.
In the same way that: "I have a sheep" means one sheep
And, "I have sheep" Means more than one sheep.
Note for later, jordbær is also both singular and plural.
I just want to propose a singular word for sheep, while we're here: Shep.
Now we could say "I have sheep, I have a shep"
Just a thought.
No indefinite singular marker (en, et) or definite singular marker (-en, -et).
Say what? You used the wrong word. I do not like open sandwiches.
What is an open sandwich? Where did the word open come from?
An open, or open-faced, sandwich is a sandwich consisting of only one slice of bread with toppings on it - not two slices with a filling in-between.
When Norwegians talk of smørbrød, they usually mean the former, but when English-speakers talk of sandwiches they're usually referring to the latter.
because a smørbrød is an open sandwich apparently.
A sandwich is "Sandwich" Thank you earl of sandwich for bringing your invention to the world.