[thestephen]

I assign a mnemonic to a composite (usually radicals, sometimes combinations of radicals). timerol's example in this thread is excellent; here's another example.

脂: Meaning: Fat. Consists of 旨 (tasty) and 月 (moon). However, mnemonically, 月 occurs in many characters referring to "flesh" of some kind, and as such is what I often use as a mnemonic cue. This creates the quite natural mnemonic cue of "tasty flesh". As such, when seeing this kanji, my thought process when repeating the character goes something like "the tasty part of flesh - the fat!".