Genuinely one thing I have seen that can end food deserts is urban farming, and community gardens, yet we just don't do that because it hurts profit margins
And when I say this I mean like one or 2 houses with a few chickens and like half the houses with a raised garden in the back yard, maybe a community garden in the empty lot.
And on a higher intensity end we have large scale urban farming which I feel can be done in a lot of brownfield, and parking lots within most of our cities
Or for High density cities like New York, putting planters on the roofs of skyscrapers, all of these are tried and tested ways of reducing reliance on corperate American and unsustainable farming practices to feed the people in out growing cities