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Wash, hull, and chop strawberries. Lightly mash if desired.
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Add strawberries to a medium saucepan. Stir in sugar and lemon juice.
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Bring mixture to a gentle boil over medium heat, stirring often.
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Reduce heat slightly and simmer 15–25 minutes until thickened.
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If using pectin, add according to package directions.
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Test jam by placing a spoonful on a chilled plate. If it wrinkles when pushed, it is ready.
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Remove from heat and let cool 5 minutes.
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Spoon into clean jars or containers.
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Refrigerate up to 3 weeks or freeze up to 6 months.