Spicy Joint's Creamy Sesame Sauce with Lettuce Salad

Bahan-bahan (4 porsi)

• 2 tbsp Chinese sesame paste ((Note 1))
• 1/2 tbsp peanut butter ((Note 2))
• 1/2 tsp white sugar
• 1/4 tsp salt
• 1/2 tbsp oyster sauce ((Note 3))
• 1 tbsp sesame oil (, toasted (ie brown, not yellow))
• 1/4 tsp dark soy sauce ((Note 4))
• 3 -4 tbsp water ((or more))
• 2 baby cos lettuce or for authentic, equivalent amount of Chinese lettuce (celtuce) (, trimmed (Note 5 for subs))
• sesame seeds for garnish ((black, ideally for the colour, but white or roasted are fine))