you are allowed ANY amount of meat / fish / eggs as they are only protein, you are not allowed milk but you are allowed cream and butter (not low fat spreads), you're allowed proper mayo, not low fat.
You're allowed some veg I did carbs to a max 40g per day.
To ensure that you are knocked out of ketosis, you should be eating a potato, pasta, or some bread. Remember since you havent been drinking for a while you should line your stomach and dont over do it
Enjoy your hols...