Puree 2 tablespoons peanut butter, 1 garlic clove, the juice of 1 lemon and some fresh oregano in a blender. Blend in 3 tablespoons each olive oil and water; add salt and pepper. Brush 2 thinly sliced eggplants with olive oil, season with salt and pepper and grill 3 minutes per side. Top with the peanut dressing, more oregano and red pepper flakes.