1 eggplant, cut lengthwise into 3/4-inch planks
2 tablespoons olive oil
Kosher salt and black pepper to taste
2 tablespoons vegetable oil
1/2 red onion, roughly chopped
3 tablespoons brown sugar
1/4 cup cider vinegar
1/3 cup chopped fresh cilantro
Rub the eggplant with the olive oil and sprinkle generously with salt and pepper. Grill over medium-high heat until golden brown, 3 to 4 minutes a side. Remove from heat and cut into medium dice.
In a skillet, heat the vegetable oil over medium-high heat until hot but not smoking. Add the onion and cook, stirring occasionally, until slightly colored, 6 to 8 minutes. Add the eggplant, sugar, vinegar and salt and pepper to taste and cook, stirring frequently, for 3 minutes. Add cilantro and serve.