1Heat butter in a stockpot over medium heat; cook and stir leek and spinach until leek is tender, 5 to 10 minutes. Stir flour into leek mixture and cook over medium-high, stirring constantly, until mixture flour is dissolved, about 2 minutes. Remove stockpot from heat.
2Mix broth, ham, and ham bone into leek mixture; cook, stirring occasionally, over low heat until soup is slightly thickened, about 15 minutes.
3Blend yogurt, egg yolks, salt, and pepper together in a blender or food processor until smooth; carefully stir into soup. Cook soup until heated through, about 5 minutes more. Remove and discard ham bone.
Footnotes
Cook's Notes:
The chicken broth can be replaced with half chicken broth and half water, if desired.
Fresh spinach can be used in place of the frozen, if desired. If so, cook spinach in boiling water and drain well.
Canadian bacon can be used in place of the ham, if desired.
Ingredients
12 servings
148 cals
2 1/2 tablespoons butter
1 leek (white part only), chopped
1 (10 ounce) package frozen chopped spinach, thawed and drained