Don’t fret kitty, the family want to spend time with you and each other, not criticise the food! It’s a rotten time of year to be anticipating surgery.
If it were me and freezer space allowed I’d stash some good quality sausage rolls, ready filled vol au vents, and tempura prawns. All easy to heat through with the pigs in blankets. If a step too far for the freezer I’d add them to a grocery order for delivery as close as possible to the day. There would also be some small cakes (lemon and chocolate as ours love both) or posh biscuits for our awkward squad who won’t eat mince pies. I’d be thinking very, very simple, but then no one expects complexity here
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Good luck with the operation , hope all goes well.