Scottish Mince and Tatties

Mince:

• 1 lb (454 gr) extra lean ground beef
• 1 medium yellow onion, finely chopped
• 2 medium garlic cloves, minced
• 2 tbsp cornstarch
• 1/4 cup dry red wine
• 1 cup beef broth (I use OXO Beef and I use 2 small packages (4.5 grams each) per 1 cup of water)
• 2 medium carrots, peeled and chopped into small pieces (around 5 cm)
• 1 cup fresh, canned or frozen peas
• 2 tbsp Worcestershire sauce 

Potatoes:

• 4 large russet potatoes, peeled and cut into quarters
• 2 medium dried bay leaves (optional)
• 1 tsp kosher salt
• 2 tbsp unsalted butter
• 1/2 cup whole milk
• 1/2 tsp fresh ground black pepper