The desert is just filled with this wonderful fruit, free for the taking.
2 1/2 pounds of fruit (tuna) will yield a little over 2 1/2 cups of juice.
Use red, ripe, tuna (fruit). If fruit is very ripe, try to include some under-ripe ones to add pectin. A handy way to gather fruit is to use a long-handled fork or tongs and a heavy paper bag. It is not necessary to remove the spines, as they will come off when fruit is pressed through cheesecloth or filter paper. Brush the pears with a vegetable brush.
To handle these, first use tongs and a knife to scrape the prickly spines off, then trim the edges off. Some hold them over a burner to burn the spines off. After doing this, cut off the ends.
* Usually 1 box, but measure because different brands contain different amounts.
Prickly pear fruits are rich in vitamin C, and colored by betacyanins, both of which are powerful antioxidants. They are a good source of fiber, and are high in calcium and magnesium.
Here is a recipe for Prickly Pear Margarita.