Shepherd's Pie Recipe | How to Make Perfect Shepherd's Pie

Shepherd's pie - perfect comfort food for cold winter days. Follw this recipe to learn how to make perfect shepherd's pie.
Ingredients:
For the meat mixture:
2 pounds (1kg) ground lamb
1 large onion, chopped
3 garlic cloves, crushed
3 tbsp olive oil
4 tbsp (30) flour
1/2 tsp salt
1/2 black pepper
1 tsp rosemary
1 tsp thyme
1 tbsp tomato paste
2 cups beef broth
7oz (200g) carrots
7oz (200g) peas (fresh or frozen)
For the puree:
3.5 pounds (1.5kg) potatoes
1 tbsp butter
1/2 cup (120ml) milk1/2 tsp salt
1/2 black pepper
egg yolk

Directions:
1. Peel the potatoes and cut into 4. Place in a medium pot and cover with cold water. Set over high heat, add a teaspoon of salt, cover and bring to a boil. cook until tender.
2. While the potatoes are cooking, heat olive oil in a pan over medium heat. Add the onion and sauté 2-3 minutes, add crushed garlic and chopped carrots, sauté until the carrots are tender, about 5-7 minutes.
3. Add the ground lamb, Cook until no longer pink, about 5 minutes. Season with salt, pepper, chopped rosemary and thyme. Add tomato paste, flour and stir.
4. Add beef broth and frozen peas. Bring to a simmer, reduce heat to low and cook, stirring occasionally, until sauce thickens.
5. When the potatoes are done cooking transfer them to a bowl. Add butter, milk, egg yolk, salt and pepper. mash the potatoes until smooth.
6. Preheat oven to 400F (200C).
7. Layer the meat mixture in a 13"X8.5" (33X22cm) ovenproof dish. Spread the puree over the meat mixture.
8. Bake 20-25 minutes. or until mashed potato is golden brown.
1/4 cup (25g) cheddar cheese