Procedures

1. 1

   Preheat a gas grill or prepare a fire in a charcoal grill.

2. 2

3. 3

4. 4

   Brush on both sides with 3 to 4 tablespoons of the olive oil and season with salt and pepper.

5. 5

   Place the onions on the hottest part of the grill and cook, unmoved, for 4 to 5 minutes, until just charred on the first side. Turn and cook for 3 to 4 minutes more, or until softened and lightly charred on the second side. Transfer to a baking sheet or platter and remove the toothpicks if you used them, then carefully stack the onion slices—like pancakes—on a serving platter.

6. 6

   5. Whisk the remaining 1/4 cup olive oil into the vinegar mixture and drizzle it over the onions. Serve warm or at room temperature.