Re: The food at the restaurant are alterable/customizable.
"Food" is uncountable so you can't say "Food are customisable ..."
Do you mean that individual items on the menu can be changed by the customer when ordering? For example, if the menu includes a beetroot and feta salad topped with sesame seeds, the customer can ask the waiter to bring that dish but without the sesame seeds. Or perhaps a pasta sauce which contains small pieces of sausage could be altered for a vegetarian customer if that customer requests the sauce without the meat.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.