Mmm, it's a funny texture which you can either love or hate. Guacamole is a good bet, they could eat it with Doritos or pitta bread and if they like the taste then maybe try them with chunkier bits.
At an anniversary dinner I went to before CHristmas, one of the courses was half an avocado mothered with stilton and grilled until brown and bubbling. To be honest, I don't think cooking the avocado did much for it's taste (and the cheese was strong too).

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Dwell simply ~ love richly