Cottage pie - Olive Oils from Spain

Ingredients

• 1.1 lb ground beef
• 1 large onion, chopped
• 2 carrots, peeled and chopped
• 2 celery stalks, chopped
• 2 garlic cloves, chopped
• 2 tablespoons tomato paste
• 1 cup beef broth
• 2 tablespoons Worcestershire sauce
• 2 tablespoons all-purpose flour
• 2 tablespoons Spanish olive oil
• 1 teaspoon salt
• 0.8 lb of potatoes
• 1/4 cup of extra virgin olive oil
• 1/2 cup of hot milk
• 1 teaspoon salt (optional)