First attempt at slow cooker gammon

[Liveinthepresent]

I have a 700g gammon joint, onions, a can of diet coke or a bottle of Stella cidre, some carrots, broad beans, frozen peas and leeks - can anyone advise what combination sounds best so I hopefully don't have to bother going out to the shops today?
Cooking for a friend so don't want to risk an unfortunate experiment!
Also never cooked with gammon - do I need to do some pre boiling business I keep reading about ?
TIA if you can help a novice

Leave all the vegetables out because the stock off gammon is inedibly salty IMHO. Use the cider and water, maybe a cinnamon stick if you've got it.

Thanks cogito makes sense - would that mean I don't have to pre boil it then?
I have some cinnamon - good idea!

Today's gammon joints don't need soaking normally. Just discard any liquor that comes off after it has cooked.

Thanks it's in the pot. Fingers crossed .. Not much can go wrong !