Schav Summer Soup

• 1 pound sorrel leaves, stemmed, washed
• 2 tablespoons cooking oil
• 1 large sweet onion
• 6 cups water or light chicken broth
• 1 teaspoon kosher salt or to taste
• 2 tablespoons sugar
• 1 lemon, juice only
• 2 large egg yolks
• sour cream for garnish

1. In a large saucepan or Dutch oven, melt butter and saute sorrel and onions for about 10 minutes or until sorrel is wilted and onions are translucent. Add water or stock and salt. Bring to a boil. Reduce heat and simmer 30 minutes.
2. Remove from heat and stir in sugar and lemon juice a little at a time, tasting after each addition of lemon juice, until desired tartness is achieved.
3. Temper the egg yolks with a few tablespoons of hot soup, then stir the tempered egg yolks back into soup. Turn heat on and cook until slightly thickened and simmering but do not allow it to boil as the eggs will curdle. Cool, cover and chill .rnServe with sour cream stirred in.

sorrel, cooking oil, sweet onion, water, kosher salt, sugar, lemon, egg yolks, sour cream

Taken from food52.com/recipes/26284-schav-summer-soup (may not work)