Fill a large pot of water and bring to a boil.
Once water is boiling, add in the chunks of daikon and cook for about 5 minutes.
Transfer the daikon to a bowl and drain the water.
Return the pot to the stove and bring to medium-high heat.
Heat 2 tablespoon of oil in the pot over medium heat.
Add in the minced shallot and garlic and sauté until fragrant, about 2-3 minutes.
Next, add in the turmeric and sa cha sauce (Chinese BBQ sauce) and fry for another minute.
Pour in the water and scrape off the brown bits on the bottom of the pan.
Add in the daikon and 50g (½ block) of Japanese curry roux and give it a stir to dissolve the curry.
Place the lid on and bring to a simmer.
Add in the frozen fish balls, along with 1-2 pieces of bay leaf.
Give everything a stir and cover with the lid.
Let the mixture come to a boil and then lower the heat to simmer for about 10 minutes, until the fish balls are cooked through, stirring intermittently.
Serve piping hot.
Note: if the curry appears thick, add a little water to thin it out.