Samuel Adams Irish Red Shepherd's Pie With Shamrock Potatoes

Ingredients

• 2 pound ground lamb
• 3 pound yukon gold potatoes, peeled
• 2 cup frozen peas
• 2 cup frozen corn kernels
• 2 cup diced carrots, cooked
• 2 bottles samuel adams irish red
• 2 cup beef stock
• 1 yellow onion, diced small
• 2 tablespoon minced garlic
• 1/2 cup flour
• 2 tablespoon tomato paste
• 1/2 cup butter, divided
• 1 cup milk
• 1 cup chives
• 1 cup parsley
• 1/8 teaspoon nutmeg