Thai Grilled Eggplant with Spicy Peanut Sauce

Ingredients

• 1 1/2 lbs Japanese eggplants (4-5 medium), sliced lengthwise
• 2 tbsp vegetable oil
• 1/4 cup peanut butter
• 1 tbsp rice vinegar
• 1 tbsp lime juice
• 1 tbsp soy sauce
• 1 tbsp brown sugar
• 1 tbsp ginger root, grated
• 1/2 tsp crushed red pepper flakes
• water, as needed
• 1 small head bibb or other large leaf lettuce
• chopped scallion, cilantro or peanuts (optional garnish)