Prep the strawberries by washing, hulling, and roughly chopping them. Add the chopped strawberries, sugar, and lemon juice to a large pot. Place over medium-high heat.
While stirring frequently, bring the strawberries to a boil. Reduce the heat to medium-low to keep the strawberries at a simmer. (If it boils too hard it can overflow the pot, so reduce the heat more, if needed.) Let the jam simmer for about 40-50 minutes, frequently stirring, until the jam is thick and syrupy and reaches 220F on a candy thermometer. If you don't have a candy thermometer, check to see if it's ready by adding a small drop to a frozen plate and check the consistency. Remove the jam from the heat if it's thickened to your liking or continue simmering until desired consistency.
When it’s done, pour the jam into a sterile mason jar and chill overnight. ENJOY!