Morning_shadow, I have been following the diet where you give each pig 1/8 a cup of pellets, unlimited hay, and a cup of lettuce, daily. the other veg I give is well varied with a fare amount of green peppers, I use a chart that has all the vegetables in groups of how often they can/should have them. I don't know how much more I can spend on veggies than I already do but I would be over joyed if you would share you vegetable diet. I have been trying to find the best most natural diet and there is so much contradicting information that it's hard to know what's really right. There is always the same basic idea but hearing it from someone who it has worked for would be great!
I feed mine twice a day.
For breakfast I give: Butternut squash, Boston lettuce, green pepper( 2-4 little squares), cucumber and little bit of zucchini.
For dinner: Zucchini, Boston lettuce, green pepper (6 squares), cucumber.
You can make variations every other day: switch Red(or colorful) pepper instead of the Green for breakfast (2-4 squares). Switch zucchini with yellow squash. Also every 2-3 days add a little bit of carrot for breakfast, or sweet potato (2 slices per pig).
Add fruits like: banana, apple, pear, tomato every now and then. (not too much fruit though, 2 slices per pig).
I don't give any kale, spinach, parsley, cilantro.. because they are high calcium. But this is just me having fear of stones showing up. I hear they're very good, and in the past my piggies do love them, but I would say give maybe once a month, a little bit if you want.
Don't forget to always water down veggies in plate. Also daily clean the water bottle with baby bottle washer, and give them unlimited Timothy Hay. I suggest 2nd cutting Hay from Small Pet select. They deliver to your door and is much less dustier than the store brands.