Shepherd's Pie - Mr. Cook

Ingredients

• 2 lbs Russet or Yukon Gold potatoes, peeled and quartered
• 4 tbsp unsalted butter
• ½ cup whole milk or heavy cream, warmed
• ½ cup grated sharp cheddar cheese (optional, for topping)
• Salt and freshly ground black pepper to taste
• 1 tbsp olive oil
• 1 large yellow onion, finely chopped
• 2 carrots, peeled and diced
• 2 celery stalks, diced
• 1½ lbs ground lamb (or ground beef for Cottage Pie)
• 2 cloves garlic, minced
• 1 tbsp all-purpose flour
• 1 tbsp tomato paste
• 1 cup beef broth
• ½ cup red wine (optional)
• 1 tbsp Worcestershire sauce
• 1 tsp dried thyme
• 1 tsp dried rosemary
• ½ cup frozen peas