What's the easiest way to resurrect deceased sims now?

My question is how do you even get the ghost to eat the Ambrosia? You don't have control over the ghost and I have tried leaving a plate of it out on the counter every night and the ghost just ignores it. Do you have to make friends with the ghost and ask them to join the household? Somewhere I missed something but I have adjusted and just let the dead be dead and make it part of the story.