Hope you enjoy your time here in Thailand. If you come to Ayutthaya again and want to eat local food I recommend boat noodle (ก๋วยเตี๋ยวเรือ) it's quite famous at Ayutthaya. And if you want to eat grilled prawn I recommend restaurant around "Ayutthaya Central Agricultural Market" it's sell mostly fish and prawn the price is depend on size of the prawn but it's need a car or taxi to go there. Have a safe trip 😇