First clue:

I'm no laughing matter.
But something there is that doesn't love my brother,
so you dug deep to create me.


Second clue:

I'm food.
I'm popular in Morocco.
But I'm even bigger in Israel.


Third clue:

I'm a special kind of armament,


The question:

What capital city am I?

First hint:

The three clues are independent riddles; each has a different (and topically unrelated) answer, which is different from the answer to the question.

Second hint (for the third clue):

This is a Nahuatl-derived word.

• Just to make sure, is the second line of the first clue exactly meant as written? It seems lime you perhaps meant to switch 'is' and 'there' – Avik Mohan Sep 7 '16 at 19:09
• The word order is correct. Or, rather, faithful. – Sneftel Sep 7 '16 at 19:13
• Pretty good puzzle. I never did get clue 1, can you elaborate? – John Sep 8 '16 at 17:50
• @John You got the gist of line 2; it also describes why the thing exists, kind of. Line 1 is a play on words from the name (and quite accurate, if you walked into one), and line 3 describes how the thing is made. – Sneftel Sep 8 '16 at 18:03
• Ah ha! Hadn't heard of a ha-ha. Nice. – John Sep 8 '16 at 18:07

The answer to the third clue, given the hint, must surely be

atlatl

(which I thought was the only Nahuatl word I knew, until I actually started looking for others; but none of the others I found seems to have the right sort of meaning).

And since (per John's answer) it seems that the answer to the second is probably

couscous

and, aha!, the first one must be

haha.

So perhaps the capital city we're looking for is

Pago Pago.

• ** Good Stuff! ** – John Sep 8 '16 at 0:05
• I actually have a tab open in the same browser window as this clue with your suggested city (based on suspicion from answer 2 and the way the puzzle was framed), but couldn't figure out either the first or last clue to confirm. Just FYI, Israeli couscous is actually physically bigger than other types. ;) – Dan Russell Sep 8 '16 at 2:19
• How did you get from the clues to the conclusion of "Pago Pago"? Can you elaborate on that? – Kirex Sep 8 '16 at 5:33
• @Kirex, if clue 1 was 'haha', and clue 2 is 'couscous', and clue 3 is 'atlatl', then you're looking for a city that is a repeated name. So, Pago Pago fits. Note that the OP mentioned that the clues were 'topically' unrelated. So, their repeating pattern was how they were related. – John Sep 8 '16 at 17:53

Oy, vey! Is it:

Back to Jerusalem?

I'm no laughing matter.
But something there is that doesn't love my brother,
so you dug deep to create me.

Possibly a progression of Wailing [Wall] > Frost's Mending Wall > [Mending] Well.

Second clue:

I'm food.
I'm popular in Morocco.
But I'm even bigger in Israel.

Couscous, or ptitim made from semolina.

Third clue:

I'm a special kind of armament,