Had lunch there this weekend during an outing to Fry's. Had three regular tacos ($1.55/cilantro, onions, salsa) -- al pastor, carne asada and chorizo. All were good and authentic. Also tried their pork tamales, which were good too. Fairly extensive menu, free chips/salsa bar, and reasonable/low prices. Not necessarily worth a special trip, but good to know about if you're in the area. In the strip mall in front of Fry's (where The Mediterranean is located). 1747 Willow Pass Rd., Concord.