In Berkeley, try Cactus Taqueria on Solano Avenue. Just get the tres leche cake. It's soaked in rum and milk and delicious. My friend from Mexico says it's the best she's ever had! All I know is we have to share a slice, it's too much to eat on your own, and then we sit around with huge smiles on our faces =) My 21 year old son made me drive a piece down to college in Los Angeles, he was jonesing for it so badly!