On the side street next to the parking lot behind B & B Hardware on Washington Blvd, one block west of Centinela, there is a vendor selling bacon-wrapped hotdogs with grilled onions. He said he's there every day from 11:30 to 6:00 pm (I think that's what he said - either that or 11 to 6:30.)
The hotdogs are $3, come with grilled onions, ketchup, mustard & mayo. A guy waiting in line said sometimes the vendor throws on avocado, but I didn't get offered that, nor did I ask for it.
The setup is basically a foil covered cookie sheet sitting on a sterno can. The vendor cooks 1-2 dogs at a time in the middle of the sheet with a few more waiting on the edge for their turn on the flame. On the side, onions fry in the oil generated from the hotdogs and bacon.
He also has soda & chips. Behind him is a vendor selling cut fruit.
BTW, side note, I noticed there's a hole-in-the-wall place on Washington a couple doors east of B & B, closer to Centinela that says Tacos Estilo Mexico - any good?