Spinach and Yogurt Soup Recipe

Ingredients

• 1.5 tablespoons butter or margarine
• 1 medium onion, finely chopped
• 2 teaspoons all-purpose flour
• 0.33333334326744 teaspoon salt
• 0.25 teaspoon dried tarragon
• 1 pinch ground nutmeg
• 1 pinch cayenne pepper
• 1 (16 ounce) package frozen chopped spinach, thawed
• 2 cups chicken broth
• 0.75 cup plain yogurt
• 2 slices lemon, cut in half for garnish