Use something up before it goes off

I need to use up half a tub of double cream and a bunch of dill going limp before it goes off. I also have: potatoes, eggs, onions, some smoked salmon

Give me three ways to use it, in this order:
1. The one that uses the most of it tonight.
2. The one that turns it into something that keeps for another few days, and how long that keeps.
3. The laziest option, for when I cannot face cooking.

For each, keep it to a name, one line on what to do, and the time it takes.

Then tell me plainly whether the ingredient is actually still fine to use, what to look for, and when I should just throw it away. Do not be reassuring about this if it is borderline.

What you get: Three uses ranked by how much they get through, plus a straight answer on whether it's still good.