In a blender or small food processor blend lime juice, water, soy sauce, garlic, gingerroot, sugar, and red pepper flakes until smooth and with motor running add 6 tablespoons oil in a stream, blending until sauce is emulsified.
In a bowl toss beef with 6 tablespoons sauce and remaining 2 tablespoons oil and marinate 15 to 30 minutes. Prepare grill.
In a bowl, stir together coriander, mint, scallion, and remaining sauce. Thread 2 filet cubes onto each skewer and grill on an oiled rack set 5 to 6 inches over glowing coals 3 to 4 minutes on each side for medium-rare. Serve beef sates with dipping sauce at room temperature.
Recipe courtesy of Gourmet Magazine