I like to use those cheap simple stoves with Hexa blocks if I want a cup of tea or a soup.
http://de.wikipedia.org/wiki/Esbit
In an iddle moment, I converted a trangia windshield form the Mini Set, available separately for € 5,-
http://www.trangia.se/english/2924.mini_trangia.html
into a separate burner for blocks and twigs:
The edges were folded over, four bolts and eight nuts made the feet and some more holes provide ventilation
Its round shape makes it fit into a large cup better than the original rectangle ones.
It works better with twigs than with the Hexa blocks, because here the latter burn faster and create higher flames, which surround the rather small (o,5l) cup and make the fuel more inefficient.