I'm just about sure this is a problem for the whole idea, if it's tricky in LA and Portland, Oregon. If I were going to play with ideas on it, I'd make the effort broader based than about fixing dinner. I might go to at least some container gardening, and work for reduction of that asphalt heat sink with, gasp, trees. Native trees appropriate to the site, but that's another story and would have to be carefully studied. Well, hey, LA is a semi arid desert and was sans trees.
A prominent volunteer group planted wrongo trees in our tiny parking strips, just as I was having to sell and leave (sob). I was a homeowner who refused, since I knew that tree needed twelve feet of parkway, at the least. I wrote letters on that but was probably taken as a crank. I look at the street ten years later, a bunch of verdant leaners and yes, there is the damned tree in front of my old house, soon to be a sidewalk wrecker, and an overhead line impinger, thus a massacred pruning victim. This has been done throughout the city under city aegis before, but now by volunteers.