Try Tom Yam#44 of 114 things to do in Phuket
The problem of choosing the right place for eating out is solved in no time: choose a cafe where mostly locals, not tourists, are hanging out.
Having made up your mind as for the eatery, you will face a new problem: what to order? The ample choice will make you giddy, and unfamiliar names will puzzle you: who knows what they will eventually serve you?
So, your first pick can be one of the most popular dishes, like Tom Yam. This sweet-spicy soup on chicken broth with shrimp or other seafood (sometimes you can find a recipe of Tom Yam with chicken or pork).
For themselves, the Thais cook a super spicy soup, but they would never serve it to tourists. Just in case, tell them «not spicy».