This 1-for-1 is meant to promote their Gold Flakes. I don't think it is stated here, but at the stall itself, the staff will tell you that the Gold Flakes or Silver Flakes is a must.

My friends and I added Green Tea Mochi & the sweet potato which cost 50 cents per topping. We expected more mochi and sweet potato, but all we got was 2 pieces of mochi and 2 pieces of sweet potato.
(Not sure what y'all will think about it, but i find 2 pieces is too little...)

BUT....

We find the ice cream not bad as it wasn't so sweet for the Green Tea flavour and the Salted Caramel flavour.
Since it's a 1-for-1, i can't expect too much...

Overall, it was okay... We were just shocked at the final bill - $11.50 for the 2 cups of ice cream & 2 pieces of Mochi and 2 pieces of Sweet Potato...