You mean the one with the pink tacos?
Is it Es Tas?
El Azteca is good in Ankeny, they have a location in Ames also out on highway 30.
Dos Rios on Court Ave. in downtown Des Moines is pretty good Authentic mexican as well.Go to Carlos OKelly's. The only good authentic Mexican restaurant I've had is El Rodeo in Urbandale
IMO, its not authentic unless I have a burning ring of fire 4 hours later and one margarita can do me in. Just my opinion.
What size? I have yet to try the fishbowl but the jumbo has done me over several times.
Dos Rios on Court Ave. in downtown Des Moines is pretty good Authentic mexican as well.
I'd suggest you try this place as well. The make the guacamole right at your table exactly how you like it (spicy, not spicy, with lots or little vegetables, ect)