Clean and devein the prawns.
Garnish the prawns with salt, turmeric powder, minced garlic, and shallots. Fry until golden brown and set aside.
Fry 4 large prawns in a wok or pan until they are cooked through and crispy.
In another pan, sauté lemongrass, 1/2 small onion, and 5 cloves of garlic until fragrant.
Add 1/3 cup coconut milk to the pan and stir well. Bring the mixture to a simmer.
Add water as needed to reach your desired consistency, whether soupy or thickened with more coconut milk.
Place in the bay leaves, sugar, salt, and enough tempoyak for taste (about 4 tablespoons). Stir until the tempoyak is fully incorporated.
Taste and adjust seasoning if necessary. Cook for another minute to allow flavors to meld.
Return the prawns to the pan and stir gently to combine. Garnish with peanuts or petai before serving.