Combine garlic, green chilies, coriander, sugar, fish sauce and one-fourth cup lime juice in blender's bowl. Puree.
Bring water to boil in a saucepan with one-fourth teaspoon salt and remaining lime juice. Poach seafood two to three minutes, or until cooked. Drain and toss in a bowl with the coriander dressing. Add pepper, scallions and red chili. Garnish with coriander leaves and serve warm or at room temperature.