01 - Toast the bread slices in a toaster or on a grill pan until golden and crisp to your preferred level of doneness.
02 - Halve the avocado, remove the pit, and scoop the flesh into a small bowl. Add the lime juice, a pinch of salt, and a crack of black pepper. Mash with a fork until nearly smooth, leaving some texture.
03 - Divide the mashed avocado evenly between the two toasted bread slices, spreading it to the edges in an even layer.
04 - Spoon the chopped kimchi over each toast, distributing it equally across both slices.
05 - Sprinkle with toasted sesame seeds and chopped green onions. Finish with red pepper flakes and a light drizzle of sesame oil if desired. Serve immediately while the bread is still warm and crisp.