Hamburger near Half Moon Bay/San Mateo Area
The 3 Zero Cafe is a fun stop. It's at the Half Moon Bay Airport in Princeton-by-the-Sea, and has a nice aviation theme to it. This is not a Zuni level burger, but it fits the bill when I take my son horseback riding at Moss Beach Ranch.
1658 Market Street, San Francisco, CA 94102
On the high end, slightly exotic side, Pasta Moon in HMB has a lamb burger with harissa at lunch.
Chez Shea, also on Main in HMB has a Ranchera burger at lunch too. I have not tried it but I would consider it a good bet based on the quality of their other items.
315 Main St., Half Moon Bay, CA 94019
408 Main St, Half Moon Bay, CA 94019
On San Mateo side The Counter just opened at Hillsdale Shopping Center - haven't tried that location but Palo Alto is really good.
My favorite is Godfather's on the Belmont/San Mateo border - they're awesome. Jack's Prime in San Mateo is really goooood too.
Hillsdale Shopping Center
3101 S El Camino Real, San Mateo, CA 94403
3723 S El Camino Real, San Mateo, CA 94403