A velvety springtime classic from the gardens of Saint-Germain-en-Laye, this elegant French soup pairs dried split peas with tender butter lettuce for a fresh, herbaceous finish. Traditionally enriched with butter and a touch of cream, it is light yet satisfying, with a pale green hue and silky texture.
Prep Time15 mins
Cook Time60 mins
Total Time75 mins
Servings6
Yield6 servings
Nutrition Facts
Per serving (estimated)
- 295 kcalCalories
- 9 gFat
- 4.5 gSaturated Fat
- 38 gCarbs
- 14 gFiber
- 5 gSugar
- 18 gProtein
- 520 mgSodium
- 740 mgPotassium
- 75 mgCalcium
- 3.2 mgIron
- 9 mgVitamin C
- 190 mcgVitamin A
Ingredients
For the soup
- 1 lb (about 2 cups) dried green split peas, rinsed and picked over
- 1 small yellow onion, finely chopped
- 2 tablespoons unsalted butter
- 6 cups chicken or vegetable stock
- 1 small head Boston or butter lettuce (about 3 cups), cored and shredded
- 1 bay leaf
- 1 small smoked ham hock (about 8 oz), optional
- 1 teaspoon kosher salt, plus more to taste
- 1/2 teaspoon freshly ground black pepper
For finishing and serving
- 1/4 cup heavy cream
- 2 tablespoons unsalted butter, cut into small cubes
- 2 tablespoons fresh chervil or flat-leaf parsley, finely chopped
- Buttered toasted baguette slices or crisp croutons, to serve
Directions
- Place the rinsed split peas in a large bowl, cover with cool water by 2 inches, and soak for 4 hours or overnight; drain well.
- In a heavy Dutch oven, melt the 2 tablespoons of butter over medium heat. Add the chopped onion and cook gently for 5-6 minutes until soft and translucent but not browned.
- Add the drained split peas, stock, bay leaf, ham hock (if using), and 1 teaspoon salt. Bring to a gentle boil, skim any foam, then reduce heat to maintain a low simmer.
- Partially cover and simmer for 45-55 minutes, stirring occasionally, until the split peas are completely tender and beginning to break down.
- Stir in the shredded lettuce and continue to simmer, uncovered, for 8-10 minutes until the greens have wilted into the soup and turned a soft olive-green color.
- Remove and discard the bay leaf and ham hock. Working in batches, puree the soup in a blender until very smooth, or pass it through a food mill for a more rustic texture; return to the pot.
- Whisk in the heavy cream and taste for seasoning, adjusting salt and pepper as needed. Stir in the cold butter cubes until melted to give the soup a glossy finish.
- Ladle into warmed bowls, scatter the chopped chervil or parsley over the top, and serve immediately with toasted baguette slices or croutons on the side.
Cook’s Notes
- An overnight soak ensures the split peas cook evenly and shortens the active simmer time.
- Butter lettuce is traditional because it melts into the soup without bitterness; iceberg or romaine will work but taste greener.
- For a deeper savory note, simmer the ham hock from the start and pick off any meat to stir back into the pureed soup.
- Whisk the cold butter into the finished soup off the heat to create a silken, lightly thickened texture without diluting flavor.
- The soup thickens as it sits; thin leftovers with a splash of warm stock when reheating.










