This quick and flavorful Brazilian marinated onion recipe (cebola em conserva) is the perfect side dish or appetizer to accompany any meal. Small roasted onions are blended with bold ingredients like garlic, olives, chilli, and fresh herbs, then preserved in a mix of olive oil, balsamic, and apple cider vinegar. The result is a zesty, savory treat with a beautiful texture and complex flavor — ideal for BBQs, tapas, or as a delicious antipasto.