Begin by carefully washing the perilla leaves and patting them dry with a paper towel. Make sure to take care of each leaf, as they are delicate.

In a mixing bowl, combine garlic, white onion, sugar, red chili powder, water, sesame seeds, light soy sauce, and sesame oil to create a smooth kimchi paste.

Lay out a perilla leaf, spread a small amount of kimchi paste, and then sprinkle the green onion slices. Repeat this process for the rest of leaves, layering them in the container.

Store the container at room temperature for a day to allow the flavors to meld. It will be ready to eat the next day, or you can serve them right away! (The kimchi will be at its freshest when first made, and it will become more fermented and tangy as time goes on.)

Sprinkle additional roasted white sesame seeds and green onion slices if needed. Enjoy your homemade perilla leaf kimchi!