Cassava and Curry Beef meal (Mihogo na Nyama )

Ingredients 
1 1/2 pounds cassavas (about 3 by 8 inches long ), peeled and cut into 2-inch cubes 
1 pound beef stew 
1 3/4 pounds broccoli cuts into small florets
1 diced tomatoes
2 cloves garlic, minced 
1 teaspoon chopped fresh ginger 
1 teaspoon curry 
1 diced onion 
Coconut milk (option) 
Olive oil