Sweet Potato Cauliflower Shepherd's Pie

Name: Sweet Potato Cauliflower Shepherd's Pie
Prep time: 40 min
Cook time: 25 min
Total time: 1 h 5 min
Cuisine: European, American, British
Ingredients: 1 lb. (454g) sweet potatoes (peeled and chopped into small chunks); 1/2 lb. (227g) cauliflower (chopped into small chunks); 1/4 cup chicken broth; 3 tbs butter; 1 tsp salt; 1/2 tsp ground black pepper; 2 tbs light olive oil; 1/2 medium onion (diced); 2 carrots (diced); 2 cloves garlic (minced); 1 tsp salt; 1/2 tsp ground black pepper; 1 1/2 lbs. (680g) ground beef; 2 tbs tapioca starch ((if you have no problems with gluten, flour is fine)); 1 cup chicken broth; 3 tbs tomato paste; 1/2 cup corn; 1/2 cup peas; 1/2 cup fresh grated Parmesan