1 Painted Serpent cucumber, ends trimmed off
1 pound green beans, trimmed
1½-inch piece ginger, peeled, finely grated
1 serrano or Fresno chile, minced
1 garlic clove, finely grated
⅓ cup unseasoned rice vinegar
¼ cup white miso
¼ cup olive oil
½ teaspoon toasted sesame oil
toasted sesame seeds and sliced scallions (for serving)