Itadakimasu. (polite expression used before commencing a meal.)
oshokujichuu ni shitsurei itashimasu
I'll be joining you at mealtime.
oshokuji wa manzokushite itadakemashitaka
Did you have enough to eat? ; Was it good enough for you?
takusan tabete kudasai
Please have plenty to eat.
don･na ryouri ga sukidesuka
What kinds of foods do you like?
yukkuri de ii desuyo
It's all right if you want to take your time.