Wash the beans and rice in plenty of cold water. Combine about 4 cups of water with beans and rice and cook for 5o minutes or until the beans are soft. Drain, reserving the stock for later.
2
Heat oil in a skillet. Fry the onions for 3 minutes.
3
Add the carrots and cook covered for 5 minutes.
4
Add the cooked beans and rice. Stir well and let saute for a few minutes, ensuring that the mixture does not burn.
5
Combine the soy sauce, tomato paste, herbs and stock.
6
Mix well and pour into the skillet. Bring to a boil, reduce heat to very low, partially cover and simmer gently for 30 minutes, stirring frequently to prevent it burning. Add more stock if necessary.
7
Transfer into a casserole. Top the cooked vegetables with mashed potatoes.
8
Bake in a preheated oven at 350F for 40 minutes, or until the potatoes are browned.