Tom yum soup - must be authentic one, made with blue ginger,
lemon leaf, lemon grass, chili padi and lime juice. Not those
pseudo ones all over the foodcourt and hawker centres that came out
from a bottle. 
Other appetisers: Thai mango salad, Thai papaya salad, calamari
salad = all sweet and sour and/or hot. Appetising enough?
I must make my tom yum soup this weekend... 