THere many of these threads, read, enjoy, learn, prepare.
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Having trouble using that cup on the ol' Esbit to heat up your dinner? Do you balance the cup on a partially closed stove - but worry that it will tip over? In searching the site, I did not see anything on this.
Well, here is a set of mods to the stove that should fix that problem - and allow you to use a USGI canteen cup or commercial cook pot on your Esbit without worry.

This shows the cup, the problem and parts needed to fix the problem.

This shows the spoke parts in place and one windscreen piece in place.
Set up like this, you can burn wood to cook with as well.

With both windscreen parts in place. Very stable for USGI canteen cup or other larger cook pot.
Here is the stove with a USGI canteen cup

and a commercial 'camping cup'

You should be able to dope out how to cut these items after looking at the photos. The windscreen material is a roofing patch from Home Depot, the spoke was obtained from the local REI bike repair shop just for the asking.
The windscreen mod has been floating around the net for some time, but the use of the spokes is new - to me at least. Hope this helps you update your kit to make it more cooking friendly.