Every time you say celery, I don't know what it really is. Is it the tops of the celery, because we typically eat the stalk. Or maybe it's something else all together, but that's what you call it in your part of the world.
This is what I think of when I hear celery.
Many times the top (leaves) are chopped off before purchase.
In my country (Indonesia) we don't have big celery like in your image. Big celery usually just for juice
Yeah, you can take part just leaves. And do not use the stem part 😊
I think that's funny since many times the grocery removes the leaves before putting it out to sell. I've never used celery leaves. We chop up the stalk and use that for added flavor and crunch in various items.
Many of us like to take a stalk and fill the inside of it with peanut butter to eat that way.