|1. Make the dip by combining the buttermilk ranch dressing, cucumber, horseradish, wasabi, salt, and cayenne pepper into a blender. Blend on low until well mixed. Pour into a small bowl and refrigerate (can be made ahead). The dip will thicken as it chills.|
|2. Place the water in a saucepan over medium-high heat. Add the beans, cover, and bring to a boil; reduce heat to medium and simmer until beans are bright green and tender, about 8 minutes. Immediately drain beans into a colander and rinse under cold water. Set aside to cool.|
3. Combine the beaten egg with milk in a shallow bowl. Place the flour in another shallow bowl. In a third shallow bowl, combine the panko bread crumbs, salt, black pepper, garlic powder, and onion powder. Working with a handful of beans at a time, dip each bean first into flour, then into the egg mixture, and then into the bread crumb mixture. Place beans on a plate until all are coated.
|4. Heat 1 1/2 inches of oil in a deep skillet (or use a deep fat fryer) over medium-high heat to 350 degrees F (175 degrees C). Fry the beans several at a time, without crowding, until golden brown. Drain on paper towels. Serve with horseradish wasabi dip.|