2/3cupOlive oil or other neutral vegetable oil, room temperature
1largeEgg, separatedkeep yolk and white apart; reserve egg white if needed
1teaspoonDijon mustard
1pinchSaltor to taste
Optional garnishes
Croutons
Extra olive oil for drizzling
Smoked paprika
Chopped fresh parsley
Instructions
In a large pot, pour in the chicken stock and add the fresh sage. Heat over medium until it reaches a gentle simmer.
While the stock warms, prepare the garlic by peeling the cloves and cutting each clove in half lengthwise. Remove any green shoots from the center.
Place the halved garlic cloves into a small pot of boiling water and boil for 3 to 4 minutes.
Drain the garlic and mash the softened cloves with a fork until smooth. Stir the mashed garlic into the simmering stock and let it simmer gently for 10 more minutes.
In a small jar, combine the egg yolk, Dijon mustard, a pinch of salt, and the olive oil. Use an immersion blender to blend until thick and glossy.
If the emulsion struggles, add a bit of reserved egg white and blend again.
Strain the garlic-sage broth through a fine-mesh sieve into a clean pot, pressing gently on solids to extract flavor.
Temper the emulsified yolk mixture by stirring a ladleful of hot soup into the jar while whisking quickly. Then slowly whisk the tempered emulsion back into the pot of hot soup.
Heat gently on low for a few minutes to meld flavors, but do not boil.
Taste and adjust seasoning with more salt if needed. Serve hot, garnished with croutons, a drizzle of olive oil, smoked paprika, and fresh parsley.
Notes
Store leftovers in an airtight container for up to 3 days. Reheat gently on the stove over low heat, stirring frequently.