This iconic dish is a favorite in Singapore, but traditionally, the crabs are fried in the chile mixture. Here we offer a healthier grilled version. Place each crab on its back, and snip off the small pointed flap at the lower part of the shell known as the apron; remove the fat beneath the apron. Rinse the entire crab well, and pat dry. Once cleaned, pop the crabs in the freezer for 30 minutes before marinating them.