Steak with Maple Cippolini Onions

Ingredients

• Steak

  • 2 beef striploin steaks, each about 11 oz (310 g) and 1 1/2 inches (4 cm) thick
  • 1 tbsp (15 ml) vegetable oil
  • 3 tbsp cold butter, cubed
  • 2 garlic cloves, halved
  • 2 rosemary sprigs

• Onions

  • 1 1/4 lb (565 g) cippolini onions, peeled and halved horizontally (see notes)
  • 3 tbsp (45 ml) sherry vinegar
  • 3 tbsp (45 ml) maple syrup