Simple sweet potatoes soup

This a a warm soup for the turning of autumn. Raining outside, would it be nice to enjoy a warm soup at your dinner while looking at the rain falling on the window?

                  

Ingredients

600 g sweet potatoes
1 rubagata
2 potatoes
1/2 onion
70 g butter
400 ml water
1 cup cream
1 tsp salt according to taste

Directions

1. Chop the onion into chunks.
2. Peel and cut the sweet potatoes, potatoes, rubataga into 3 cm pieces.
3. In a large saucepan, melt the butter in high heat, add the onion, soften about 2 minutes.
4. Add the root vegetables, and stir fry until fragrant but not burn. Pour the water, bring to boil and reduce to medium-low heat. Simmer until all the vegetables become soft and cooked through. Add the cream and salt.
5. Set aside to cool about 5 minutes and blend the soup until smooth with emersion blender. Serve with baked bacon.