1. Combine first 6 ingredients in a blender; blend until smooth. Pour mixture into a 13- x 9-inch baking dish, and add tofu cubes, turning to coat. Marinate 45 minutes, turning occasionally. Meanwhile, soak skewers in water at least 30 minutes.
2. Preheat grill to medium-high heat (350° to 400°). Thread tofu and bell peppers on skewers, reserving marinade.
3. Grill skewers, turning occasionally, 6 to 8 minutes or until peppers are lightly charred and tender. Serve with Sticky Coconut Couscous; sprinkle with cilantro.