The current World Street Food Congress (31 May - 9 June) at the F1 Paddock, Marina Bay, offers some very interesting street food stalls from around the world.
One of my faves was Sabina Bandera of La Guerrerense from Baja, Mexico - it voted one of the top 101 street food stalls in the world by Newsweek, and recommended by Anthony Bourdain.
La Guerrerense's legendary seafood tostada, topped with crab salad, octopus ceviche, fresh coriander, Spanish onions, tomato, and avocado, with a squeeze of fresh lemon juice. Everything tasted so clean and fresh here! Must-not-miss!!