Amazing food! This is as authentic as it gets considering the chef is from Viet Nam!
Their pho, and the broth in particular, is superior to every other Vietnamese restaurant I've tried in the valley. All the other places have let me down when compared to Sunflower! Having spent a decent amount of time in Viet Nam myself, this is the only place that tastes authentic to me. I've ordered their pho many times, both dine-in and take-out prepared at home, and it always tastes the same and it is perfect.
Their banh mi sandwiches are delicious too. They make a butter in house that they put on the sandwiches that is sooo good. And the way they marinate the meat is perfect - I have yet to find better ones anywhere else!