Rinse the soy beans in cold running water. Drain and put them in a pan.
Add 2 cups of water to the pan and soak the beans for 8 hours.
Cover and boil the mixture of beans and water over medium-high heat for 10 minutes. If it boils over, crack the lid.
Add soy sauce, sugar, vegetable oil, and garlic. Stir a few times with a wooden spoon. Reduce the heat to low, cover, and cook for 30 minutes.
Open the lid and turn up the heat to medium-high heat, stirring with a wooden spoon until the beans turn shiny and a little wrinkly.
Remove from the heat and sprinkle with the sesame seeds. Let cool and transfer to an airtight container. Refrigerate up to 1 month.
