WEST LOS ANGELES. It’s said that the true test of a restaurant’s authenticity is its clientele ­ if expats eat there, it must be the real thing. Monte Alban is the real thing. Its strip-mall location may not be the most elegant, but the decor is warm and festive. Of course, the reason most people show up is for the food ­ specifically, for moles (sauces) that grace most dishes and send Oaxacan food lovers into spasms of pure delight. Whether you choose black, red, yellow, or green mole, you’re sure to be satisfied. And if you’re not sure what or how to order, the friendly staff are happy to point you in the right direction.