I don’t eat spicy food. At all. What I realized within a day in Jakarta is that whenever you order, the default is spicy.
Hence, the first Bahasa Indonesia word I’ve managed to memorize is PADAS. This means spicy. To add a negative, we simply have to add TIDAK (pronounced as Tidah). So just point and say Tidak Padas?
They will nod if not spicy, say padas if spicy. 😉