How do I structure a comparative essay?

My preferred way to go about structuring a comparative essay (an essay which asks you to compare aspects from two or more texts) is called the "ping-pong approach", because essentially what you do is take the aspect(s) which you have decided to tackle during the course of your essay, and analyse and explain this aspect in context with reference to each text one at a time, figuratively batting between the texts. Alternatively, if you're focussing on more than one aspect or theme presented in the texts, you can tackle the two (or more) texts within the same paragraph, taking a new one for every new point you wish to make in relation to the texts.