Shepherd's Pie with Lamb - Simple Seasonal

Ingredients

• 1 Tbsp safflower or canola oil
• 1 C chopped sweet onion
• 1 C chopped carrots
• 1 lb ground lamb
• 1 tsp Worcestershire sauce
• 2 cloves minced garlic
• 1/2 tsp salt
• 1/2 tsp black pepper
• 1/4 tsp dried thyme
• 1/4 tsp dried crushed rosemary
• 3 Tbsp all-purpose flour
• 3 Tbsp tomato paste
• 2 C beef broth
• 1 C frozen sweet peas
• 2 lbs yukon gold potatoes
• 4 Tbsp butter*
• 1/4-1/3 C vegetable broth
• 1 tsp salt
• 1/4 tsp black pepper
• 2 egg yolks lightly beaten