It's interesting how we've learned the words for fruit and berries, but not for vegetables :O
We only eat chocolate in Sweden. :D But in case anybody else is wondering, the word is grönsaker - literally "green things".
- Singular: en frukt och ett bär
- Plural: frukter och bär
- Mass nouns: frukt och bär
So for berries, you'll have derive contextually.