Trim off the bottom third of the stems. Separate the parsley into a loose bunch. Pick through and discard any wilted, damaged or yellow stems and leaves.
Put the leaves and tender stems in a large bowl of cold water. Swish the parsley around for a few seconds, then let sit 5 minutes to allow the dirt to settle to the bottom of the bowl.
Lift the parsley out of the bowl, leaving the debris behind. Place in a salad spinner and spin dry.
At this point, you can gather the the bunch of parsley into a bouquet, and put it in a cup of water. Keep it in the fridge or on the counter, picking what you need as you cook. Or you can put the washed parsley on a double layer of paper towels (or a clean kitchen towel). Pat the leaves gently, then roll the towel up with the parsley inside. Stick the rolled towel in a zippered plastic bag and refrigerate.
To chop the parsley. Set a damp paper towel under your cutting board to keep it from sliding around. Pile the parsley into a compact heap. Chop
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Notes
Washed and dried parsley leaves will keep for a week, refrigerated. Store it wrapped in damp, rolled towels placed in a zippered plastic bag. Or stand the whole bunch (with the stems trimmed) in a cup or jar with some water in the bottom.
Chopped parsley will keep 2-3 days in the refrigerator, covered.
Dried parsley: Leave chopped parsley on a plate or shallow bowl at room temperature for a day or two. It will darken slightly in color and slightly dehydrate in texture.
Freezing: Chopped parsley can be frozen in a small, airtight container up to one month. It will lose its fresh green color, but can still be used in cooked dishes.