Brazilian Shepherd’s Pie

Name: Brazilian Shepherd’s Pie
Cuisine: American, Latin American
Ingredients: 500g ground beef (or shredded dried beef, carne seca); 1 medium onion, finely chopped; 3 cloves garlic, minced; 1 tbsp olive oil; 1 medium tomato, chopped; 1/2 cup tomato sauce; 1/4 cup fresh parsley, chopped; Salt and black pepper to taste; For the mashed cassava (topping); 1 kg cassava (yucca), peeled and cut into chunks; 2 tbsp butter; 1/2 cup milk; Salt to taste; 1/4 cup grated Parmesan cheese (optional); 1/2 cup mozzarella cheese, shredded