This simple dish contains an astonishing variety of flavors and textures.
If the peas are frozen, defrost them in cold water to cover while you prepare the other ingredients.
Wash and dry the radicchio; tear leaves into small pieces. Toss in a bowl with the apples and red pepper. Boil the peas (whether thawed or fresh) in salted water for 1 minute. Drain and rinse in cold water.
Toss three quarters of the peas with the salad. Combine the yogurt, horseradish, vinegar, salt, and pepper in a blender or bowl and blend or whisk until smooth. Taste and correct seasoning, then dress the salad. Garnish with the reserved peas.
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