Wash and hull the strawberries and place them in a large pot. Sprinkle sugar over the top and stir to distribute.
Allow the strawberries to stand in the sugar to macerate for about 6 hours (covered).
Prepare a water bath canner and canning jars.
Place the strawberry pot on the stove and add citric acid (optional but helps to help protect quality during storage.) Bring the strawberries (and their juice) to a simmer and cook for about 1 minute until the berries are heated through.
Pack the berries into canning jars and cover with strawberry juice liquid, leaving 1/2 inch headspace.
Remove air bubbles, adjust headspace and seal with 2 part canning lids.
Process in a water bath canner for 10 minutes (pints) or 15 minutes (quarts), adjusting canning times for altitude.
Notes
Note - Sugar is optional, and strawberries can be preserved in either plain water or juice instead. The flavor is much better with a small amount of sugar to balance the sugars that will be lost to the canning liquids. Feel free to reduce the sugar if you'd like, but I'd suggest a minimum of 1 tablespoon per pint.Alternately, for very sweet dessert berries, the sugar can be increased to 3/4 cup or even 1 full cup per quart of berries.