ごちそうさまでした
Meanings
1
thank you for the meal; that was delicious
polite (teineigo)usually written using kana alone
Polite expression used after eating to thank the person who prepared or paid for the meal. Also said when leaving a restaurant. The past tense でした is standard, though ごちそうさま (present) is used casually.
I said 'thank you for the meal' and left the table.
Thank you so much for tonight's dinner; it was truly delicious.