Tengak-tengok signifies “looking around repeatedly” in Indonesian. There are many bicyclists cruising the streets and cul-de-sacs (culs-de-sac? ehh) of Jakarta, hawking various foods, wares and services; much of the goods they have are just as easily found as many other parts of the world, so I tried to snap a few shots of less-common, or at least more likely to be found in residential area mobile merchants. Also, my work schedule at the time permitted a lot of exploring around the Big Durian, thus the desire to tengak-tengok for good eats and curious diversions.
Have you collected them all? Bear in mind though, this series is not at all exhaustive; most other bike vendors I saw involved food, ergo those qualify for a separate entry.