In a large saucepan bring water to boil and add carrots and sweet potato. Cook until the vegetable is tender, around 8-10 minutes. Drain and set aside to cool down.
In another saucepan, add olive oil, onion, garlic cloves, green beans, and peas. Sauteé for 5 minutes.
Add all the spices, diced tomatoes, and tomato paste. Simmer for another 5 minutes.
Preheat oven to 200 Celsius degrees.
Turn off the heat and add butter beans to the saucepan with tomato mix. Add salt and/or pepper according to your taste. Place the mix to a prepared casserole dish.
Add the cooked and cooled sweet potato and carrots to a blender and blend until smooth mixture is formed. Add salt and/or pepper according to your taste.
Spoon blended sweet potato and carrots over the pie in the casserole dish.
Bake Shepherd's pie in the oven for 25 minutes.
Garnish with fresh coriander leaves and diced spring onion.
Enjoy!