Since the owner is a family friend, I've been visiting this little Mission shop since I was a kid. Now I realize how lucky I was! Head straight to the back of the store and look for the ladies grinding masa and making their delicious homemade tortillas. They also sell the best chicken tamales and carnitas I've ever had, as well as breakfast burritos and lots of other prepared foods.
The shop also sells everything you would need to prepare your own mexican meal at home.
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