Yü W.
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I usually don't wait in line for anything, but I would happily break that rule for SUSU. It's that good.
SUSU is a walk-up only shop in the International District that only opens Friday to Sunday from 11am to 3pm. If you want to have the whole menu to choose from, however, get there before 12pm otherwise you might miss out on their popular "Durian Pâte à Choux", or the seasonal cake which they offer just one with 8 (big) slices each day.
That's what I like about SUSU. They don't aim to sell as much as they can but only bring out the best quality stuff. Their menu is "chef's choice" and is always featuring something new and fun. Durian Pâte à Choux, Whiskey Truffle (my two favorites and damn they are making my mouth water now!), Basque Cheesecake, and Kouign Amann are menu staples; then they have cakes, flatbreads, scones, tarts in different, elaborate flavors every week, even cookies! One week you have Coconut Orange Poppyseeds Cake, the next it's Tropical Carrot Cake. I enjoy going to SUSU not knowing what they have and surprise myself. I never failed to find something intriguing and I'm glad to have my favorites on the menu every week.
SUSU's Durian Pâte à Choux is popular for a reason. Its crust is crunchy but thin, wrapping inside a generous amount of smooth, refreshing durian cream. Not too sugary nor heavy, it tastes like the sweet breeze over an Indonesian beach. When I got the Smoked Salmon Pesto Flatbread, I wasn't expecting cream cheese stuffed under the thick salmon slices and was impressed by the complex and well-balanced layers in one single pastry. When a lox bagel often goes north of $10, this flatbread for $6.5 is absolutely a bargain and by itself justifies the 15-min wait.
When a place is so good that it has a perpetual line, their staff often gets cocky or arrogant, but SUSU's lady at the window is such a sweetheart, taking care of everyone with a beam of glee and ardor. She obviously enjoy bringing deliciousness and happiness to her customers than wearing her pride on her sleeve. I really appreciate that.