I give all my vegetable peelings, uncooked, and fruit peelings, to our pigs.
Garlic, Onion ends, and everything go into it.
The only thing they have left till last, but still eat eventually, has been lemons.
I make a lot of chutneys and jams for the farm shop, so they get a good variety of things, but only a handful each, and they get their pig food every day as well.
If they don't like something, they will leave it, but if they get hungry later may return and eat it.
We were laughing at a recent pig course, one attendee always chopped up the apples of the pigs wouldn't eat them - we said - if you stop chopping them up, they will eat them, your making them lazy. The other thing is to spread the food around if they are in a field, so that they have to go and find it, and make sure that they get exercise and don't just eat and lay down, or you will have more fat than meat when they go on hoildays.