What's a good method for generating an artificial gravity field for both the exterior and interior surfaces of a hollowed asteroid?

I am writing a story where the main setting is a hollowed out asteroid with an interior biosphere and an exterior city. In this case, using centripetal force to simulate gravity would not work, because the biosphere is covering the entire interior surface, and the city is covering the exterior. I would like some ideas for creating a true artificial gravity field that would pull the people living on this asteroid towards its shell.

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What's a good method for generating an artificial gravity field for both the exterior and interior surfaces of a hollowed asteroid?

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