01 -
Warm up the chicken broth gently in a big pot or Dutch oven. Toss in the sage leaves so they can flavor it while you get the garlic ready.
02 -
Carefully peel each garlic clove, then slice them lengthwise. Look for the little green shoot in the middle of each clove and remove it with a toothpick or knife to avoid any bitterness.
03 -
Use a small saucepan filled with boiling water to cook the garlic pieces for about 3-4 minutes. Drain all the water out once they're soft.
04 -
Press down on those soft garlic cloves with a fork until they're nice and smooth like a paste. Stir this into your simmering broth, and let it cook on low heat for another 10 minutes so everything comes together.
05 -
In a tall jar that's right for an immersion blender, combine the yolk, mustard, a dash of salt, and the oil. Blend from the bottom up to make a thick and silky mayo. If it's too thin, mix in the egg white for a second try.
06 -
If you want an extra smooth consistency, pour the soup through a mesh strainer (totally up to you) before returning it to the main pot. Blend a scoop of hot soup into the mayo to warm it up, then gently mix it all back into the pot.
07 -
Warm the soup slowly, just enough to heat it through. Don't let it boil, or it might not stay mixed properly.