Heat pan on medium heat. When warm, add olive oil. Cook until shimmering.
Lower heat and add garlic. Good until fragrant and remove at the very first sight of browning.
Turn heat back up to medium. Toss in a handful of the leeks, and a handful of the green onions. Saute for about 3 minutes.
Add remaining ingredients. Stir.
Pour in fresh cold water until veggies are covered by 2". Some will float so eyeball it.
Cover and simmer for 1 hour. Add water if level drops below the veggies.
Scoop out the veggies and herbs and discard (or eat the carrots, they are freakin' yummy, but they'll be uber-hot!)
Strain into large measuring cup or storage containers. Allow to cool to room temperature.
Store in the fridge for 3 days. Store in air-tight freezer containers for up to 6 months.