Ingredients

  • 2 tablespoons olive oil
  • 1 medium-size yellow onion, chopped
  • 1 celery rib, minced
  • 1 large eggplant, peeled and diced
  • 1 medium-size red or green bell pepper, seeded and chopped
  • 3 garlic cloves, minced
  • One 14.5-ounce can diced tomatoes, drained and chopped
  • 1 tablespoon tomato paste
  • 2 tablespoons red wine vinegar
  • 1 tablespoon sugar
  • 1/2 teaspoon dried basil
  • 1/4 teaspoon dried oregano
  • 1/4 teaspoon red pepper flakes, or to taste
  • Salt and freshly ground black pepper
  • 1/3 cup black olives, drained, pitted, and sliced
  • 1 tablespoon capers, drained and chopped
  • 1 tablespoon minced fresh parsley leaves

Method

  • Heat the oil in a large skillet over medium heat.
  • Add the onion and celery, cover, and cook until softened, about 5 minutes.
  • Add the eggplant, cover, and cook, stirring occasionally, until the eggplant begins to soften, about 5 more minutes.
  • Transfer the mixture to a 4-quart slow cooker.
  • Add the bell pepper, garlic, tomatoes, tomato paste, vinegar, sugar, basil, oregano, and red pepper flakes, and season with salt and pepper.
  • Cover and cook on Low until the vegetables are soft but still hold some shape, about 6 hours.
  • When the vegetables are cooked, stir in the olives, capers, and parsley.
  • Taste to adjust the seasonings.
  • Transfer the caponata to a bowl and let cool.
  • Serve at room temperature.
  • If not serving right away, cover and refrigerate until needed.