The cleanest way I could think to do this would be with a plugmold strip.. mounted face down under the lip of the granite, with a granite bullnose just as deep as the plugmold.. There was a counter top guy I worked this with and he had some beefy (and pricey!) epoxy that we used to mount the plugmold to the granite. Backfed the plugmold from a GFCI outlet where the wall began. The disposal had some fancy pneumatic push button on the sink itself, so there wasn't anything really visible.
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