Bup N.
Yelp
Saw this on Yelp and immediately wanted to try it. It's a coffee truck, located outside of a rock climbing gym. Parking can be tight but honestly, if it tastes good then you'll have the patience to find a spot.
I got the Es Yan and it's quite good. Not sweet (after mixing it) and it tastes just as delicious as it looks. I placed the order via their website and immediately when I got there, I was greeted warmly and maybe I was the only one who had a recent order but he immediately knew that it was for me (given that it was my first time there).
Shortly after me, a couple of people came. They close early otherwise, I would've came back later in the day to order another one or something else from their menu!