Questions & Answers about Fatet har en tunn kant och en tjock botten.
Fat is the basic form, meaning a dish / platter.
Fatet is the definite singular form: the dish / the platter.
So:
- ett fat = a dish
- fatet = the dish
The ending -et is the normal definite ending for many ett-words.
Because Swedish normally does not use en/ett together with a bare definite noun.
You choose one or the other:
- ett fat = a dish
- fatet = the dish
So ett fatet is not correct.
A learner should know, though, that Swedish sometimes uses a separate definite word when there is an adjective:
- det stora fatet = the big dish
But in your sentence there is no adjective attached to fatet, so just fatet is correct.