Savoury version of caramel or sugar cage
You can make some pretty delicate cages using pastry, which is (or can be) pretty neutral in flavor.

An example is posted on a foodie blog post about a dinner they had at the restaurant L'Heritage in Kuala Lampur.

  


  Slow-braised Black Angus ribs with sweetbread &amp; morels in a choux pastry cage.


Images for "choux pastry cage" are pretty easy to find and they seem to be made in a couple of ways:


A "lattice" style cage that uses flat (premade) puff pastry dough into which slits are cut and then stretched to create openings and then baked. This can be done by hand or with a specialty rotary cutter called a "lattice cutter". Described in detail in this Joepastry article.
Using choux pastry, pipe the pastry around a form in the pattern you like using a small tip and then bake. This is described in a YouTube video here.


Joe Pastry's beautiful caged pears using the lattice cutter look like this:



The choux pastry from the video comes out looking like this... he uses them as bowls but you should be able to use them as cages instead.