Radish Soup from Soup: A Way of Life by Barbara Kafka

Ingredients

• 10 ounces (300 g) mashing potatoes, peeled and cut into 1-inch (2.5-cm) cubes
• ½ cup (120 g) yogurt, optional
• Toss 2¼ cups (270 g) of the radish slices with the vinegar.
• Kosher salt, to taste
• 3 scallions, trimmed and thinly sliced across
• Freshly ground black pepper, to taste
• 1 medium cucumber, peeled, seeded, and cut into ¼-inch (.5-cm) dice
• 2½ cups (625 ml) Basic Chicken Stock or commercial chicken broth
• ¾ pound (360 g) red radishes, trimmed and thinly sliced across
• 2 tablespoons red wine vinegar