- Generously grease grill and preheat barbecue to medium-high. Place tofu on several layers of paper towel then cover with additional paper towel. Place a plate on top of paper towel, then a heavy object such as a jar of peanut butter, to press out any water from tofu. Let stand 20 minutes.
- Meanwhile, in a medium bowl, stir peanut butter with miso, ginger, 2 tbsp (30 ml) lime juice from the lime, soy sauce and chili garlic sauce until combined. Whisk in water.
- Cut tofu into chunks, 1 to 11/2 inches (2.5 to 4 cm) in size; they will be rectangular in shape. Add to peanut butter mixture and stir. Cut yellow pepper and onion into pieces about the same size as tofu.
- Once the grill is nearly preheated, thread tofu, pepper and red onion onto skewers. Barbecue, turning and brushing with any remaining marinade, for a total of 5 to 6 minutes. Serve with lime wedges on a platter sprinkled with peanuts and mint.