Soto ayam is a yellow spicy chicken soup with lontong or nasi empit or ketupat (all compressed rice that is then cut into small cakes) and/or vermicelli or noodles, commonly found in Indonesia,Singapore, and Suriname. Turmeric is added as one of its ingredients to get yellow chicken broth. It is probably the most popular variant of soto, a traditional soup commonly found in Indonesian cuisine. Besides chicken and vermicelli, it is also served with hard-boiled eggs, slices of fried potatoes, Chinese celery leaves, and fried shallots. Occasionally, people will add "koya", a powder of mixed prawn crackers with fried garlic or bitter Sambal (orange colored). Krupuk are a very common topping.
Different regions have their own variation of this dish, for instance:
Soto Ambengan, originated from Ambengan, Surabaya. Soto Ambengan is famous for its delicious koya topping.