Step 1

Preheat oven to 400°F with a rack in upper third of oven; line a large baking sheet with foil. Cut brussels sprouts in half lengthwise. Using a melon baller, carefully remove inner leaves to form a scoop shape (reserve leaves for another use). Trim excess stem from bottom of each half.

Step 2

Toss scooped halves with oil, salt, and pepper on baking sheet. Bake until crisp and browned, about 25 minutes.

Step 3

Whisk mayonnaise, vinegar, miso, honey, and soy sauce in a small bowl until well combined. Arrange brussels sprout halves on a serving platter; serve with miso dressing.