Stir together over medium heat. Let the mixture come to a boil.
Let it boil until it's reduced to 1 cup. This should be achieved after about 15 minutes.
Notes
This recipe will yield 1 cup (or 8 ounces) of soy sauce. The smaller bottles you buy at a grocery store are typically 5 oz, so this will give you plenty to use in your recipes and for your condiment needs.In terms of cost, the entire recipe will cost about 90 cents, which is a lot cheaper than any bottle of decent soy sauce you can buy in the market. Considering you’ll have plenty of leftover ingredients to use in other recipes, you'll come out ahead by a long shot!