I feed mine dandelion greens, endive, mustard greens, chicory, escarole, radicchio, turnip greens, shreaded carrots, shreaded yellow squash, they love color so I also cut up red peppers or yellow peppers as a treat. Hannifords carries pads of the prickly pear in their produce aisle. Of course you have to pull out the cactus thorns but I've read that they really like it... Mine hasn't really taken to it. I also mix in orchard hay/grass into his salad. You can buy timothy hay and orchard hay in the pet store- near the rabbit food area. I chop it up because he has a hard time eating it. Grape leaves are also very good for them but I've had a hard time finding it.
Sprinkle on calcium-D3 supplement daily. Kim @ turtlecafe said that it should look like a very light snow had fallen on the salad. Also offer cuttlefish bone. My leopard loves the cuttlebone I gave him.
here are two good links as well as the turtlecafe but you already know about that one:
www.chelonia.org/Articles/Mistypardaliscare.htm
africantortoise.com/diet.htm
Hope this helps!
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Lisa 
1 Mali Uro - Spike
1 Leopard Tort - Herman
1 Shih Tzu - Jake
lisasmith@optonline.net
Monroe, NY