Sweet Pepper Compote with balsamic Vinegar

1. 1 large red onion, chopped
2. 30 ml (2 tbsp.) olive oil or duck fat
3. 1 sweet red pepper, diced
4. 1 sweet orange pepper, diced
5. 1 sweet yellow pepper, diced
6. 30 ml (2 tbsp.) balsamic vinegar
7. 5 ml (1 tsp.) sugar
8. To taste, salt and freshly ground pepper

Swordfish steaks

1. 4 swordfish steaks, about 200 g (7 oz) each
2. 30 ml (2 tbsp.) olive oil
3. To taste, salt and pepper