Spicy Roast Beef with Cranberry Sauce

Ingredients

• 2 tablespoons (1 fl oz or 30 ml) olive oil
• 1 1/2 lbs. (675 g) beef tenderloin
• Kosher salt and freshly ground black pepper
• 2 tablespoons (30 g) unsalted butter
• 1 (3.5 oz or 100 g) onion, chopped
• 1 teaspoon (3 g) garlic, minced
• 1 cup (8 fl oz or 250 ml) port wine
• 1 cup (4 oz or 125 g) fresh cranberries or red currants
• 3/4 cup (6 fl oz or 185 ml) beef stock
• 1 teaspoon (2 g) fresh thyme, chopped
• 1 teaspoon (2 g) dried chili flakes
• cooking oil spray