Sweet and Sour Roasted Red Onions

• 1 lb red onion
• 2 tablespoons olive oil
• 1 stick celery, finely chopped
• 1 garlic clove, finely chopped
• 1 teaspoon rosemary, picked and finely chopped
• 1 tablespoon tomato paste
• 3 tablespoons cider vinegar
• 3 tablespoons light brown sugar
• salt and black pepper

1. Preheat the oven to 190C/375F Peel the onions and cut them in half from root to tip.
2. Put into a small oven dish, so they fit snugly in one layer.
3. Heat the olive oil in a small saucepan over a medium heat and add the celery and garlic.
4. Fry gently for about 10 minutes, until soft.
5. Remove from the heat, add the rosemary, tomato paste, vinegar and sugar, and stir so the sugar dissolves.
6. Season generously, then pour over the onions and mix well.
7. Roast for an hour, until soft and caramelized, stirring halfway through.
8. Serve hot, warm or cold.

red onion, olive oil, celery, garlic, rosemary, tomato paste, cider vinegar, light brown sugar, salt

Taken from www.food.com/recipe/sweet-and-sour-roasted-red-onions-424782 (may not work)