own variation
I did a 5 gallon batch in 2012, and did 10 gallons using the same recipe and techniques in 2013. Just bottled the 10 gallons and it tastes great and similar to the 2012 batch.
I used a mix of the Jack Keller recipe, the Raymond Massaccesi reciper (winemaker's recipe handbook), and my own ideas.
I live in Superior, Arizona, and we have literally thousands of acres of some of the best prickly pear in the Southwest. Superior has a Prickly Pear Festival every August. For a 5 gallon batch, I pick two 5 gallon buckets of tunas. The tunas should come off the nopales easily, that means they are ready.
I rinse the fruit or pick them after a good monsoon. I have a, 8 quart Calphalon multipot with the past insert. I put a few inches of water in the bottom, turn the heat up, load it almost 75% full of tunas, and steam them for a few minutes. When they get soft, I mash them inside the pot a few times to get nearly all the juice out. I pull out the pasta insert, drain a bit more juice, and toss the pulpy bits into a bin. I pour the juice through cloth and a strainer, and bravo, no need to take care of the needles and glochids, they are either in the pasta strainer or in the cloth. Repeat. I then get some additional juice from my pulp bucket at the end as well.
I get my SG to about 1.09, add raisins, and I use K1-V1116 yeast.
The 2012 batch used less fruit, therefore used more sugar. The 2013 batch used a lot more fruit and required less sugar.
The 2012 batch turned a slightly red-brown rummy look. Attached is picture of the 2013 freshly bottled, which is darker. The 2013 batch has a bit more flavor, but already tastes like it is going to be as good or better than 2012.
The advantage of this method is you don't have to worry about the needles/glochids. Just take care in the kitchen with the pulp and strainer that does contain the needles/glochids.