Peel garlic. Rinse Mince roughly.
40 g garlic
Peel shallots. Rinse and mince finely.
60 g shallots
Discard abdominal flaps from crabs. Separate shell from body. Discard gills and stomach in shell. Rinse thoroughly. Drain. Twist off pincers and crack slightly with side or back of cleaver. Chop and discard last joint of small claws. Chop each crab into 4 quarters.
4 flower crabs, aka blue crabs, about 1 kg
Add 3 tbsp water to curry powder. Stir to make a thick paste.
30 g curry powder for chicken
Heat well-seasoned wok till just smoking. Add oil and heat till very hot. Add shallots and stir-fry over high heat till translucent. Add garlic and stir-fry till slightly golden. Reduce heat to medium-low.
2½ tbsp oil
Add curry paste and stir-fry till fragrant, drizzling with 2-3 tsp water at a time if spices stick to wok. Do not add too much water in one go or you'd be simmering instead of frying. If you like, you could fry with more oil instead so that curry paste doesn't stick.
Increase heat to high. Add crab. Stir-fry till thoroughly mixed and heated through, again drizzling with 2-3 tsp water at a time to deglaze spices that stick to wok. Drizzle with light soya sauce. Stir till absorbed. Add enough water to cover half of crab, about ⅓ cup. Bring to a boil, stirring to mix well. Reduce heat to low. Cover and simmer 3 minutes. Stir, then cover and simmer another 3 minutes.
40 ml light soya sauce
Crab should be cooked now. To check, pick a piece which has a pinky and ring claw and snip between the two claws with a pair of scissors. Meat is cooked if firm and opaque.
Increase heat to medium-high. Stir to mix crab and curry sauce thoroughly. Turn shells upside down, i.e. cavity facing up. Drizzle a bit of curry sauce into shells, and then a bit of egg. Drizzle remaining egg on crab. Let egg set slightly, about 5 seconds. Stir to mix through. Sauce should now be just thick enough to coat crab. Adjust if necessary by adding a bit of water if too dry, or cooking a bit longer if too watery. Taste sauce and if necessary adjust seasoning.
2 eggs, beaten
Plate and serve.