I'm curious - what do people do with the offerings placed at the altars?

Back in my old neighbourhood, me and my family do most of our grocery shopping at a local shop run by a Chinese family. I always see them placing oranges and maybe sort other sort of food at altars inside and outside the house.

But after that, what happens to the food? Will the family eat it? Throw it out? Burn it? Give it to the poor? I'm always curious about that, but am too scared to ask them.

What does the text say?

And are those real peacock feathers?