Originally Posted by jennyema
Beware that there is a botulism risk with what you did. Keep the oil in the fridge and use it or throw it away within 10 days or so.
Its easier to just buy hot sesame oil.
Yes, it's also a good idea to acidify the infusion with 1 Tbs of lemon juice or vinegar per cup of oil. Keep in the fridge and toss out if it becomes cloudy or nasty during its shelf life, according to this useful site: Oil Infusions and the Risk of Botulism
. It should scare you into compliance with its list of multiple infections from infusions of garlic in oil.
But there is an obvious possibility of the oil and acid separating, and I found a 5.5 oz bottle of hot sesame oil on Amazon for $10. If you are only using 1 tsp of the oil per quart of soup, a quart (if my math is right, and it isn't always!) should only cost 31c