1 tablespoon Dijon mustard (such as Grey Poupon(R))
2 kosher dill pickles, chopped
1 tablespoon olive oil
1 clove garlic, minced
1 sprig fresh dill, chopped
salt and ground black pepper to taste
Place cauliflower and 1/2 cup water in a microwave-safe bowl. Cook in the microwave until tender, 2 to 3 minutes; drain. Place edamame in a microwave-safe bowl; cook in the microwave until tender, 1 to 2 minutes.
Combine cauliflower, edamame, eggs, celery, bell pepper, yogurt, radishes, green onions, mayonnaise, mustard, pickles, olive oil, garlic, dill, salt, and black pepper together in a bowl; toss to distribute.