Green onions and ginger are condiments, not staple food.

I agree with the other correction, condiments in my sense are usually placed after the food is cooked but I could be wrong, Perhaps spices and herbs is a better way of saying it.

The most common way to eat ithem in China is to put some of it in when you make porridge and the porridge will be particularly fragrant.

You can see itfind them in any supermarket.

It'sThey are very popular.

But peanuts have a high oil content, and you will feel very greasyhave a greasy feeling if you eat too much.

Green onions and ginger are condiments, not staple food.

I feel like "condiments" is likely to mean something you put on food *after* it's cooked. You're at the table, the food is served, and then you apply the condiments you want - salt, pepper, soy sauce, tomato sauce, mustard, that sort of thing. But I'm not sure how I would describe the idea you're expressing. I might say "They are flavour ingredients".

Anyway, not really wrong, just strikes me as quite unusual.

The most common way to eat ithem is to put some of ithem in when you make porridge, and the porridge will be particularly fragrant.

Plural, unless you're eating a single peanut :)

"fragrant" also strikes me as unusual. I think of fragrant things as being like flowers or women's perfumes. They smell nice, but sometimes not like you would want to eat them. Some foods can be fragrant, a curry or a stir fry for sure, but maybe not porridge. But I have no alternative suggestion!

You can see ithem in any supermarket.

It'sThey're very popular.