This technique can be used for leafy greens such as collards, kale, Swiss chard, and spinach. Blanched greens can be stored in an airtight container in the refrigerator for up to 4 days. See how to use blanched greens.
Don't overlook the importance of the accompaniments. Eggs, tuna, cured meats, and other protein-rich items make the otherwise light-bodied soup a satisfying meal. Set everything out in separate dishes, and let everyone pick and choose among the offerings.