Hi, Chowhounders! My CSA box has blessed me with more tomatoes than any sane and reasonable person could eat so I am trying my hand at making a tomato marmalade. I plan on bringing it to a barbecue tomorrow and serving it with prosciutto and cheese. Do I need to go through the canning process if i am planning on serving it right away? I don't have any canning equipment and none of the stores near me carry and (I checked) Is canning even necessary if I plan on serving within 24 hours?