Blend together dried chillies (soaked until soft), fresh chillies, shallots, garlic, galangal, coriander root or stems, turmeric powder, belacan, and cashews or candlenuts. Add a little oil if needed to help the mixture blend smoothly. The result should be a thick, fragrant chilli paste.
Spread half of the sambal paste evenly across the bottom of a heatproof steaming plate. This base layer prevents the fish from sticking and allows the flavour to infuse from below.
Place the stingray piece on top of the sambal layer. Spoon the remaining sambal over the fish, spreading it evenly so the entire surface is coated. Arrange cherry tomatoes and ladies’ fingers around the fish.
Cover the plate loosely with foil or cling wrap to prevent excess water from dripping onto the fish. Steam over medium-high heat for about 20–25 minutes, or until the stingray is fully cooked and flakes easily with a fork.
Once cooked, remove from the steamer and squeeze fresh lime juice over the top.
Serve immediately while hot, preferably with plenty of steamed rice to soak up the sambal gravy.