Jagung cups are everywhere at pasar malam and bazaar Ramadan stalls. You get a styrofoam cup of boiled sweet corn kernels and the uncle ladles on melted butter, drizzles condensed milk, sprinkles sugar, and sometimes hits it with cheese powder. The corn on its own is genuinely fine, 130 calories for 150g is decent volume for a snack. The problem is that butter (108 calories from just 15g) and the condensed milk drizzle (another 64 calories from 20g) together basically double the calorie count before you even finish queuing. The full loaded version with cheese powder and extra sugar pushes up to around 380 calories. Fair warning, these are honest ballpark estimates because detailed lab data for Malaysian hawker jagung cups is basically nonexistent, so treat the numbers as a sensible guide rather than gospel.
What actually moves the number is simple: the toppings, not the corn. Plain boiled kernels with nothing on them sit at 130 calories. Add butter only and you are at 240. Add the condensed milk drizzle on top of that and you land at the standard 330. Ask the stall uncle to go light on the butter and skip the condensed milk and you can reasonably drop 100 to 170 calories off the top. Jagung bakar (grilled corn on the cob brushed with spicy butter) is actually a slightly lighter choice at around 290 calories because the butter gets brushed on rather than poured, and there is usually less condensed milk involved. If you are calorie-watching at a bazaar, jagung bakar with one ear of corn is probably your better bet compared to the full loaded cup.