Equipment
Ingredients
Produce
- 500 g broccoli, separated into bite-sized florets, stalks peeled and chopped
- 250 g yukon gold potato, peeled and diced into 1cm cubes
- 150 g yellow onion, diced
- 3 garlic, minced
- 1 lemon, zested and juiced
Fat and Liquids
- 30 ml olive oil
- 30 g unsalted butter
- 900 ml vegetable broth
Spices and Seasoning
- 5 g kosher salt
- 2 g black pepper, freshly cracked
- 1 g red pepper flakes
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 241 kcal
- Protein
- 7 g
- Carbohydrates
- 26 g
- Fat
- 14 g
- Fiber
- 6 g
- Sugar
- 6 g
- Sodium
- 1218 mg
- Saturated Fat
- 5 g
- Monounsaturated Fat
- 7 g
- Polyunsaturated Fat
- 1 g
- Cholesterol
- 16 mg
- Potassium
- 811 mg
- Calcium
- 110 mg
- Iron
- 3.5 mg
- Magnesium
- 51 mg
- Phosphorus
- 136 mg
- Zinc
- 0.9 mg
- Vitamin A
- 127 mcg
- Vitamin C
- 135 mg
- Vitamin E
- 2.4 mg
- Vitamin K
- 134 mcg
- Vitamin B6
- 0.5 mg
- Vitamin B12
- 0.0 mcg
- Thiamin
- 0.18 mg
- Riboflavin
- 0.23 mg
- Niacin
- 1.8 mg
- Folate
- 100 mcg
- Water
- 440 g
Sources: USDA FoodData Central
Method
Prepare the vegetables by cutting the broccoli into small, even florets. Thickly peel the tough exterior off the broccoli stalks and chop the tender interior. Dice the potato, and mince the garlic and onion.
Heat the olive oil and butter in a heavy pot or Dutch oven over medium-high heat until the surface reaches around 190°C/375°F. Add the broccoli florets in a single layer and sear undisturbed for 4 to 5 minutes until deeply caramelized and charred on the edges.
Use a slotted spoon to remove the seared broccoli florets and transfer them to a plate to reserve for garnish. Leave the flavored fat behind in the pot.
Reduce the heat to medium. Add the diced yellow onion, minced garlic, and chopped broccoli stalks to the residual fat in the pot. Sauté until the onions are completely translucent and softened.
Stir in the diced potatoes, red pepper flakes, kosher salt, and black pepper. Cook briefly to lightly toast the spices and coat the potatoes in the fat.
Pour in the vegetable broth and bring the mixture to a gentle boil, approximately 100°C/212°F. Reduce the heat to low, cover the pot, and simmer until the potatoes and broccoli stalks are completely tender.
Remove the pot from the heat. Carefully transfer the mixture to a blender, working in batches if necessary, and puree until completely velvety and smooth. Alternatively, use an immersion blender directly in the pot.
Stir the fresh lemon juice into the smooth soup. Taste and adjust the seasoning with additional salt or lemon juice to perfectly balance the rich and bright flavors.
Ladle the hot soup into warmed bowls. Garnish each serving with a generous cluster of the reserved caramelized broccoli florets and a sprinkle of fresh lemon zest.
Chef's Notes
- Thoroughly peeling the broccoli stalks is essential. The fibrous outer layer will never fully soften during simmering and can leave stringy, unpleasant bits in your otherwise velvety soup.
- The Maillard reaction achieved by hard-searing the broccoli florets introduces deep savory, nutty notes that elevate this from a standard vegetable puree into a complex, restaurant-quality dish.
- Always add your acidic components, like fresh lemon juice, completely off the heat. Boiling lemon juice destroys its bright, volatile aromatic compounds and leaves only a flat sourness.
- Using a combination of unsalted butter and olive oil for searing provides the rich flavor profile of dairy, while the olive oil slightly raises the smoke point to help prevent the milk solids from burning.
Storage
Refrigerator: 4 days — Store the pureed soup and seared broccoli florets in separate airtight containers to maintain texture.
Freezer: 3 months — Freeze the base soup only. Do not freeze the seared garnish, as it will become completely mushy upon thawing.
Reheating: Reheat gently on the stovetop over medium-low heat until simmering, stirring occasionally. Re-crisp florets in a dry pan if desired.
Troubleshooting
Soup texture is too thin or watery
Cause: High moisture content in the specific head of broccoli or too much broth used relative to the potato starch
Fix: Simmer the pureed soup uncovered over medium-low heat to reduce and thicken, or quickly blend in a tablespoon of instant potato flakes
Prevention: Weigh potatoes accurately and consider holding back 100ml of broth until blending to control final consistency
Broccoli florets steamed and turned mushy instead of searing
Cause: Pot was overcrowded with florets or the initial heat was too low
Fix: Remove florets, increase the heat significantly, and return them to the pan with a little extra oil to force browning
Prevention: Sear the florets in batches if necessary and ensure the pan oil is shimmering before adding them
Cultural Context
While traditional cream of broccoli soup relies heavily on heavy cream and cheddar cheese for its richness, this modern American preparation draws its comforting texture entirely from the starch of Yukon gold potatoes. This technique honors the natural, clean flavors of the vegetables while employing high-heat searing methods usually reserved for animal proteins to build profound savory layers.
