Cook. Combine the strawberries, sweetener, salt, and lemon juice in a large saucepan. Cover the saucepan and cook (covered) on the stovetop over medium heat for 10 minutes.
Mash and cook briefly to thicken. Use a fork or potato masher to carefully mash the berries, leaving some larger pieces. Continue cooking (uncovered) until the sauce is thickened to your desired consistency, about 2 to 5 minutes more, stirring frequently.
Add the vanilla. Remove from the heat and stir in the vanilla extract.
Cool. Cool to room temperature, and then refrigerate to chill.
Notes
Net Carbs: 3g per serving (2 tablespoons)
Recipe Yield and Serving Size: This recipe yields about 1 1/2 cups, or 12 (2-tablespoon) servings.
Strawberries: When strawberries are in season, I use fresh strawberries to make this jam; however, frozen strawberries also work great (store-bought frozen strawberries are usually flash frozen at their peak ripeness). If you're using fresh strawberries, add 4 tablespoons of water, and if you're using frozen strawberries, don't thaw them.
Sweetener: In the original version of this recipe, I used 1/2 cup granulated erythritol and 14 drops liquid stevia. My preference now is to use 2/3 cup granulated monk fruit/allulose blend. You can use whatever you like or have on hand.
Storage: Store in a covered glass jar in the fridge for up to 1 month. For longer storage, put the jam in freezer-safe containers and freeze for up to 1 year.
Canning: I haven't tried canning this jam, but I found that it freezes very well!