General Method Description

Bananas are used for a variety of purposes; they can be eaten as food, used as a secondary ingredient in Summoning, or given to NPC farmers as payment to watch over curry trees. It used to be possible to get large quantities of them quickly by buying them from charter ship stores, especially on the docks in Catherby. However, this method became impractical with the end of unlimited shops, so now you have to do things the old-fashioned way -- pick them from banana trees!

There are 33 banana trees on Karamja, and the amulet of glory teleport puts you right in the banana plantation for your convenience. The limiting factor in how fast you can get bananas is actually the respawn rate for the trees themselves, which is about 5 minutes and 10 seconds. This is about how long it takes to pick the trees, so it works out well, but this also means there is no advantage to higher level familiars here -- just use a spirit terrorbird.

Note that the respawn speed for fruit trees seems to be independent of the number of players on the server, so there's no need to try to find a full world for this.

You do need to periodically recharge amulets of glory. This can be a bit of a challenge at very low levels, and you may need to have a friend help you with this, or flip charged and uncharged amulets on the GE.