Chilled portions of lime and ricotta toppings (5)

I believe the answer is:

polar

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'chilled' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for polar that I've seen before include "Arctic and Antarctic regions, for example" , "Regions at the top and bottom of the world" , "Regions within the Arctic and Antarctic Circles" , "From one end of the Earth or the other" , "- bear; - cap" .)

I've seen this clue in the Sydney Morning Herald.

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