This Silverlaker is heading down to Costa Mesa tomorrow to grab some lunch with an old college pal in town on a business training trip. Will need to stay in the vicinity of his training HQ, the Hilton on Bristol near John Wayne Airport. Any recs as to an autentico Mexican dive to give him a break from the usual businessman's fare? Or, alternatively, a quasi-high end spot where we can take advantage of his expense account? Thanks Chowhounders.