Step 1: Place the sugar, cornstarch, cinnamon, salt, and water in a medium sized saucepan and stir until smooth.
Step 2: Stir in the blueberries and place the saucepan over medium heat.
Step 3: Cook the sauce until the liquid thickens and becomes clear.
Step 4: Taste to see if more sugar is needed and add more water if you want a thinner sauce.
Step 5: Stir in the vanilla extract, if using, and the lemon zest and juice.
Step 6: Taste and add more lemon juice if needed.
Step 7: Let cool and then cover and refrigerate.
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