01 -
Heat a dutch oven over medium heat. Add the butter and heat until it melts then foams. Add the onions, season with a pinch of salt, then toss to coat in the fat. Sauté the onions, stirring every 5 minutes, until they soften, brown, and caramelize. If the pot gets too dry and onions start to burn or stick, add a tablespoon of water or broth to deglaze the pan. You may add up to ¼ cup of liquid during the caramelization process. The onions are done when uniformly deep golden brown.
02 -
Add the garlic and sauté, stirring continuously, until fragrant, about 1 minute. Deglaze the pot with wine, stirring and scraping any browned bits. Cook until the wine is mostly absorbed, 3-5 minutes.
03 -
Add the potatoes, broth, salt, and pepper, then stir thoroughly. Top with fresh rosemary, thyme, and bay leaf. Increase heat to high and bring liquid to a boil. Reduce to low and simmer until potatoes are cooked through, about 20 minutes.
04 -
Remove herb stems and bay leaf, then add lemon juice. Blend in the pot with an immersion blender until smooth, or carefully transfer to a blender in batches. Add additional water to thin as needed. Taste and adjust seasoning with salt, pepper, and/or lemon juice until flavors are balanced.
05 -
Ladle soup into bowls. Drizzle with olive oil and garnish with fresh herbs to taste.