Now, let me tell you, there is more to do with a scallion than used it for garnish. If you look around, you can find excellent recipes that include scallions like in quinoa salad (or noodles) with scallions, scallion pancakes, scallion dumplings, and more. They have a sweet flavor that is brought out by roasting. I came across this recipe in my search and am looking forward to trying it. I have copied the important parts below.
Miso Roasted Scallions (from a website called Saveur):
Roasting scallions brings out their sweetness; finished with a tangy miso dressing, this surprising, simple dish makes a great appetizer or side.
Ingredients: 2 bunches (about 1 lb) scallions, 1/4 cup olive oil, Kosher salt and black pepper to taste 1 tbsp. white miso (I say use what you can find/have), 2 1/2 tsp Rice wine vinegar, 1 tsp sesame oil, 1 1/2 tsp hony.
Heat oven to 450°. Toss scallions with olive oil, salt, and pepper and spread evenly on a rimmed baking sheet lined with parchment paper. Bake, stirring once, until golden and wilted, about 15-20 minutes. Transfer scallions to a serving dish. Whisk miso, vinegar, sesame oil, and honey in a bowl until smooth; drizzle over scallions.