2 cups dark brown sugar
1/2 cup water
1 cup regular soy sauce
Add sugar and water to a pan and cook on a high heat until boiling, stirring occasionally.
Once the sugar dissolves, stop stirring and allow the liquid to continue cooking on a medium-low heat until it darkens. It should look a lot like molasses.
Carefully pour in the soy sauce and stir until a thicker, molasses-like texture results. Remove from the heat and store in an airtight container, refrigerated until needed.