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 ½-quart jam jar, allowing the jam to cool a bit before putting the lid on and refrigerating.
Notes
Storage: Leftover jam will keep fresh in the fridge for up to 3 weeks. Or, make freezer jam out of your small batch by popping the container in the freezer for several months.