Yum Yum Thai is a Thai restaurant on basement level two of PLQ Mall at 10 Paya Lebar Road in Geylang, Singapore, carrying a 4.6 rating on Google. A good Thai kitchen lives on balance — the sourness of lime and tamarind against fish sauce, a little palm sugar and genuine chilli heat, with lemongrass, galangal and kaffir lime leaf fresh enough to lift the whole bowl. Spice is nearly always adjustable, so ask; "Thai spicy" means what it says, and most mall diners are wise to start a notch below. Regulars tend to judge a Thai kitchen on its tom yum and its basil stir-fries rather than the pad thai everyone defaults to. A few levels below the Paya Lebar shops and an easy walk from the MRT interchange, this is a handy Thai stop for a shopping trip or a weekday lunch.