Pastured pork taste
When I first started raising pigs I did my own taste test. I purchased the best bacon (read: most costly) from costco, the cheapest bacon I could (from safeway), and then bacon from two farmers at the local farmers market. I cooked strips of each bacon in separate pans, and then cut them into identical pieces. I had 10 people taste test the results.
The unanimous opinion was that the farmers market was better, more satisfying bacon, but one of the two farmers market bacon got nearly unanimous praise. So I contacted the farmer to see what breed of pig it was, and found out that they ran a berkshire/yorkshire cross herd -- so that's what I raise. They do great on pasture, and the bacon and hams and chops are the best I've had. And I'm a dedicated carnivore.
What the pigs eat
Our pigs have access to a pasture area and a wooded area. They seem to like eating the grass roots, and there are particular areas in the woods that they seem to like. I've been wondering if there are truffles there that they're rooting out.
Here the herd of medium sized pigs has chosen an area under the trees and is searching for something.
So that's part of what pasturing is for me. When you raise a pig entirely on feed you get a pig that really doesn't have any chance to have the richer, more interesting flavor of a pig that has been able to choose its diet. My pigs eat quite a bit of grass, and it makes them a bit sweeter and nicer.