This is so easy! And SO delicious. Simply cook strawberries with sugar and lemon juice until thick. No canning necessary! Keep your jar of jar in the refrigerator where it will stay nicely for weeks.
Combine strawberries, sugar, and lemon juice in a large heavy saucepan. Bring to boil over medium-high heat, then reduce the heat to medium. Mash the fruit with potato masher.
Simmer until the mixture thickens. To determine if your jam is thickened properly, place a spoonful on a small plate and run the tip of the spoon through it. If the spoon leaves trail that does not fill in immediately, you're there. This takes anywhere from 15 to 25 minutes.
Remove the saucepan from the heat and stir in the rose water.
Transfer the jam to a 1/2-quart jam jar, allowing the jam to cool a bit before putting the lid on and refrigerating. The jam will hold for up to 3 weeks in the refrigerator.