Heat cooking oil in a wok or pan over medium heat. Add onion, garlic, and ginger. Sauté until fragrant and onion softens, about 3-4 minutes.
Stir in curry powder, turmeric powder, and chili powder (if using). Cook for 1 minute until fragrant.
Add fish balls, chicken broth, coconut milk (if using), light soy sauce, and sugar. Bring to a simmer, then reduce heat and cook for 10-12 minutes, allowing the fish balls to absorb the curry flavor. Add salt to taste.
In a small bowl, mix cornstarch with water to create a slurry. Gradually stir the cornstarch slurry into the simmering curry sauce until it thickens to your desired consistency. Cook for another 1-2 minutes.
Remove from heat. Garnish with fresh spring onions and serve hot.
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