In a heavy-bottomed saucepan, over medium heat, add the sugar, water, cream of tartar, and lemon juice.
Once the sugar dissolves, turn down the heat and let the syrup simmer steadily for about 3 to 4 minutes until it becomes a slightly thick syrup. Please remember that as it cools it will get thicker.
Use this molasses substitute in any recipe in place of molasses. It will last 3-4 months in an airtight container at room temperature.
This makes 1 1/2 cups of molasses substitute.
Notes
If it starts to harden simply heat it back up again to dissolve the granules.