Bring a large pot of water to a boil.
Add spinach and blanch for 30–45 seconds until just wilted and vibrant green.
Immediately transfer to cold water to stop cooking.
Grab spinach in handfuls and squeeze firmly to remove as much water as possible.
In a bowl, combine garlic, sesame oil, soy sauce, and salt.
Add spinach and toss thoroughly to distribute seasoning evenly.
