How do you make a Fanta strawberry soda perfect? Yes! Just add sugar! or condensed milk, to be precise.
When mixed up, Fanta Susu becomes bright pink, almost like Pepto Bismol. The condensed milk doesn't actually make the soda a lot sweeter, but it definitely gives it a heavier, richer body. I find it a little over the top, but I'm not a big fan of strawberry soda anyway. I do like Fanta Susu's cousin, Soda Susu (plain sparkling water with condensed milk).
Fanta Susu is sometimes known as Soda Gembira, or Happy Soda. Perhaps more accurately "happy for about an hour, until you crash" soda.