A bright, classic strawberry jam made with just strawberries, sugar, and fresh lemon juice—no pectin needed. Perfect for toast, yogurt, PB&Js, or cake fillings, and it scales well for gifting or canning.
Wash, hull, and chop the strawberries. Add to a large bowl and mash with a potato masher to your desired texture (chunky or smoother).
Transfer the mashed berries to a wide pot. Add sugar and lemon juice and stir over low heat until the sugar fully dissolves.
Increase heat to medium-high and bring to a rolling boil, stirring often and scraping the bottom and sides to prevent sticking.
Boil 20–30 minutes, stirring frequently, until the bubbles look thick and syrupy and the mixture reaches about 220°F (105°C) on a candy thermometer.
Test for doneness: place a small spoonful on a chilled plate, wait 1 minute, then push it with your finger. If it wrinkles and holds its shape, it’s ready.
Skim any foam from the surface for a clearer finish. Taste and add a tiny splash of lemon juice if you want a brighter flavor.
Ladle hot jam into warm, sterilized jars, leaving about 1/4-inch headspace. Wipe rims clean and seal with lids.
For refrigerator jam, cool to room temperature and refrigerate up to 3 weeks. For shelf-stable storage, process sealed jars in a boiling water bath for 10 minutes, then cool completely.
Note: Jam thickens further as it cools. If too loose after cooling, return to the pot and boil a few more minutes; if too thick, loosen with a tablespoon of hot water.