Brussels Sprouts With Caramelized Onions

Ingredients

• 1 lb (500 g) Brussels sprouts, trimmed and halved
• 2 tbsp (25 ml) olive oil
• 1 medium white onion, halved lengthwise and sliced
• 1 medium red onion, halved lengthwise and sliced
• 1 tbsp (15 ml) fresh thyme, chopped, or 1 tsp (5 ml) dried thyme
• 1/2 tsp (2 ml) salt
• 1 tbsp (15 ml) white balsamic vinegar