Mashed Cauliflower Shepherd's Pie

Name: Mashed Cauliflower Shepherd's Pie
Cuisine: European, British
Ingredients: 2 heads of cauliflower, chopped into florets; 2 tablespoons butter or olive oil; 1-2 cloves garlic, roughly chopped; Salt and pepper to taste; 1-4 tablespoons chicken broth; 1 tablespoon olive oil; 1/2 onion, chopped; 2 large carrots, chopped; Salt and pepper; 1/2 teaspoon dried thyme; 1/2 teaspoon dried rosemary; 2 cloves garlic, finely chopped; 1 pound lean ground beef; 1 tablespoon flour; 2 tablespoons Worcestershire sauce; 1/4 cup tomato paste; 1 cup chicken or beef broth; 1 cup peas