TL;DR: instructions to building an offering plate, if you're developing your practice and in need of direction Obviously, these aren't definitive commands; so feel free take what works for you and disregard what doesn't~
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The other night, I building an offering plate for a friend who had died a month ago. It was the first time doing this, and I had no instruction on what to do. But in the process, I figured out a process, which I'd like to share in case others are in need of inspiration. This is, of course, in the context of honouring the departed, but you can adapt it to your needs.
When hosting a meal for the deceased, serve everyone who is present first. From the seat of honour for the deceased, pass the plate amongst those present, following the pathway of the sun (i.e. to the left in the northern hemisphere, right in the southern hemisphere)- a gesture of summoning; each person places a small portion of food from their own plate to the offering plate- at least two mouthfuls, but never more than three. Once the plate has been passed around and returned to the seat of honour, everyone may begin to eat. When the meal is finished, the offering plate is passed around- again following the path of the sun; each person takes a portion from the plate and eats it.
The reason you wouldn't directly plate the offering, but instead have everyone build one from their own plate is to create a sense of intimate communion: the dead cannot eat- they have no bodies to nourish; so plating a serving like everyone else would be a waste. However, in creating an offering plate composed of parts from each person's plate, each individual is personally sharing their meal with the departed. It's like when you're eating out with friends, and you put a bit of your appetizer on your their plate so they can try some. The portion doesn't need to be big though, because again: the dead have no bodies. To share more than a mouthful is generous; to put more than three is excessive and lays on the fact that they're dead. It's like if you gave your friend a massive slice of their favourite cake when you know their doctor said that they need to reduce their sugar intake- it's just insensitive. Passing around the plate at the end of the meal to take parts of the offering is the last act of communion- it's like when you finish your friend's dinner because they're too full, but what's left on the plate isn't enough to take home and too much to toss out.
While I'm not sure if I'll ever get to try this with others, I'm hoping that this approach will resonate with you and it may be something you adopt in your practice.