Step 1

Heat oil in a large skillet over medium heat until hot but not smoking. Add onion; cook, stirring occasionally, until onion has softened, about 5 minutes. Add spinach; cook, tossing, until spinach has started to wilt, about 2 minutes. Transfer to a serving platter.

Step 2

Add vinegar to skillet, and heat 5 seconds. Drizzle over spinach and onion. Sprinkle with pecans and goat cheese. Gently toss. Serve immediately.