Request - Starter for Christmas Dinner that doesn't use the oven on the day?

Hi everyone

So Mum's asked me to find us a starter for this Christmas dinner. Something "cold or easy, just because we'll be pushed for oven space" (and it's true, we will be.)

For Christmas, we usually have a big chicken because we prefer it to turkey or goose and we end up basically have a British sunday roast but with all the extras and piles upon piles of it.

But given my lack of starter experience, I haven't a clue and the stipulation that it can't use the oven on the day, makes it even harder.

Any recipes that come to mind? It's not a big gathering, most likely just me, mum and my sister. No allergies in the family.

bon appetit