Elevated Shepherd's Pie

Ingredients

• 1 tbsp olive oil (15 ml)
• 1 large onion, diced (about 1 cup)
• 2 carrots, diced (about 1 cup)
• 2 celery stalks, diced (about 1 cup)
• 1 lb ground lamb (454g)
• 2 cloves garlic, minced
• 2 tbsp tomato paste (30 ml)
• 1 tbsp fresh rosemary, finely chopped (or 1 tsp dried)
• 1 tsp dried thyme
• 1 cup beef broth (240 ml)
• 1/2 cup red wine (optional, but adds depth of flavour) (120 ml)
• 1 cup frozen peas
• Salt and freshly ground black pepper to taste
• 1 tbsp Worcestershire sauce (15 ml)
• 2 lbs sweet potatoes, peeled and cubed (approximately 907g)
• 4 tbsp unsalted butter (57g)
• 1/4 cup milk or cream (60 ml)
• Pinch of nutmeg (optional)