The word "onion" as a countable noun

English as a Second Language English Vocabulary, Grammar and Idioms
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Hi dear amy
Hope you’ve been ok. in first very thanks about your suggestions and then;you added ‘s’ letter in the end of ‘onion’ word.
Realy I didn’t understand for what?
Please tell me your idea for that.

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Hi Ehsan

The word “onion” is a countable noun.
When you want to say that you like or don’t like something in general, and the thing that you like or don’t like is a countable noun, you usually use the plural form of the noun. That means you like or don’t like all of them:

I don’t like bananas.
I don’t like horror movies.
She doesn’t like snakes.
He doesn’t like politicians.
I like apples.
He likes cars.
She likes dogs.

When you want to say that you like or don’t like something in general, and the thing that you like or don’t like is an uncountable noun, you usually use the singular form of the noun:

My friend doesn’t like coffee.
I don’t like rice.
She doesn’t like beer.
We don’t like dishonesty.
I like milk.
They like fresh air.
He likes music.
.

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thanks Ehsan