On an oven-proof tray or dish heat thoroughly at 200°f:
1 pound sugar
Meanwhile, place in a pan over heat until it just comes to a boil:
1 pound strawberries, stems hulled, sliced
Remove from heat and mash to a pulp.
Add the heated sugar and beat briskly for 5 minutes.
Cover and let stand for 30 minutes in a warm place.
Beat briskly again for 5 minutes.
Refrigerate to cool if consumed soon, or place in sterilized, hot jars and seal, or freeze in small containers, for later use.